Improve README

README.md

@@ -12,6 +12,22 @@ Promises in combination with generators are used to build coroutines, which allo
 <a href="https://coveralls.io/github/amphp/amp?branch=master"><img src="https://img.shields.io/coveralls/amphp/amp/master.svg?style=flat-square" valign="middle"></a>
 <a href="blob/master/LICENSE"><img src="https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square" valign="middle"></a>
 
+## Motivation
+
+Traditionally, PHP has a synchronous execution flow, doing one thing at a time.
+If you query a database, you send the query and wait for the response from the database server in a blocking manner.
+Once you have the response, you can start doing the next thing.
+
+Instead of sitting there and doing nothing while waiting, we could already send the next database query, or do an HTTP call to an API.
+
+Making use of the time we usually spend on waiting for I/O can speed up the total execution time.
+The following diagram shows the execution flow with dependencies between the different tasks, once executed sequentially and once concurrently.
+
+![](docs/images/sequential-vs-concurrent.png)
+
+Amp allows such concurrent I/O operations while keeping the cognitive load low by avoiding callbacks.
+Instead, the results of asynchronous operations can be awaited using `yield` resulting in code which is structured like traditional blocking I/O code while the actual execution flow is handled by Amp.
+
 ## Installation
 
 This package can be installed as a [Composer](https://getcomposer.org/) dependency.
@@ -20,72 +36,51 @@ This package can be installed as a [Composer](https://getcomposer.org/) dependen
 composer require amphp/amp
 ```
 
+This installs the basic building blocks for asynchronous applications in PHP.
+We offer a lot of repositories building on top of this repository, e.g.
+
+ - [`amphp/byte-stream`](https://github.com/amphp/byte-stream) providing a stream abstraction
+ - [`amphp/socket`](https://github.com/amphp/socket) providing a socket layer for UDP and TCP including TLS
+ - [`amphp/parallel`](https://github.com/amphp/parallel) providing parallel processing to utilize multiple CPU cores and offload blocking operations
+ - [`amphp/http-client`](https://github.com/amphp/http-client) providing an HTTP/1.1 and HTTP/2 client
+ - [`amphp/http-server`](https://github.com/amphp/http-server) providing an HTTP/1.1 and HTTP/2 application server
+ - [`amphp/mysql`](https://github.com/amphp/mysql) and [`amphp/postgres`](https://github.com/amphp/postgres) for non-blocking database access
+ - and [many more packages](https://github.com/amphp?type=source)
+
 ## Documentation
 
 Documentation can be found on [amphp.org](https://amphp.org/) as well as in the [`./docs`](./docs) directory.
+Each packages has it's own `./docs` directory.
 
 ## Requirements
 
-- PHP 7.0+
+This package requires PHP 7.0 or later.
+Many of the other packages raised their requirement to PHP 7.1.
+No extensions required!
 
-##### Optional Extension Backends
+##### Optional Extensions
 
-Extensions are only needed if your app necessitates a high numbers of concurrent socket connections.
+Extensions are only needed if your app necessitates a high numbers of concurrent socket connections, usually this limit is configured up to 1024 file descriptors.
 
-- [ev](https://pecl.php.net/package/ev)
-- [event](https://pecl.php.net/package/event)
-- [php-uv](https://github.com/bwoebi/php-uv) (experimental fork)
+- [`ev`](https://pecl.php.net/package/ev)
+- [`event`](https://pecl.php.net/package/event)
+- [`uv`](https://github.com/bwoebi/php-uv)
 
 ## Examples
 
-This simple example uses our [Artax](https://amphp.org/artax/) HTTP client to fetch multiple HTTP resources concurrently.
-
-```php
-<?php
-
-use Amp\Artax\Response;
-use Amp\Loop;
-
-require __DIR__ . '/../vendor/autoload.php';
-
-Loop::run(function () {
-    $uris = [
-        "https://google.com/",
-        "https://github.com/",
-        "https://stackoverflow.com/",
-    ];
-
-    $client = new Amp\Artax\DefaultClient;
-    $client->setOption(Amp\Artax\Client::OP_DISCARD_BODY, true);
-
-    try {
-        foreach ($uris as $uri) {
-            $promises[$uri] = $client->request($uri);
-        }
-
-        $responses = yield $promises;
-
-        foreach ($responses as $uri => $response) {
-            print $uri . " - " . $response->getStatus() . $response->getReason() . PHP_EOL;
-        }
-    } catch (Amp\Artax\HttpException $error) {
-        // If something goes wrong Amp will throw the exception where the promise was yielded.
-        // The Client::request() method itself will never throw directly, but returns a promise.
-        print $error->getMessage() . PHP_EOL;
-    }
-});
-```
-
-Further examples can be found in the [`./examples`](./examples) directory of this repository as well as in the `./examples` directory of [our other libraries](https://github.com/amphp?utf8=%E2%9C%93&q=&type=public&language=php)
+Examples can be found in the [`./examples`](./examples) directory of this repository as well as in the `./examples` directory of [our other libraries](https://github.com/amphp?utf8=%E2%9C%93&q=&type=public&language=php).
 
 ## Versioning
 
 `amphp/amp` follows the [semver](http://semver.org/) semantic versioning specification like all other `amphp` packages.
 
-| Version | Bug Fixes Until | Security Fixes Until |
-| ------- | --------------- | -------------------- |
-| 2.x     | TBA             | TBA                  |
-| 1.x     | 2017-12-31      | 2018-12-31           |
+##### v2.x
+
+Supported. We don't have plans to release v3, yet.
+
+##### v1.x
+
+No longer supported. We stopped providing bug fixes 2017-12-31 and stopped providing security fixes 2018-12-31.
 
 ## Compatible Packages
 
@@ -93,7 +88,7 @@ Compatible packages should use the [`amphp`](https://github.com/search?utf8=%E2%
 
 ## Security
 
-If you discover any security related issues, please email [`bobwei9@hotmail.com`](mailto:bobwei9@hotmail.com) or [`me@kelunik.com`](mailto:me@kelunik.com) instead of using the issue tracker.
+If you discover any security related issues, please email [`me@kelunik.com`](mailto:me@kelunik.com) instead of using the issue tracker.
 
 ## License