Extracted interfaces into a separate package

Author: WyriHaximus

.github/FUNDING.yml

@@ -1,20 +1,35 @@
-# reactphp-parallel
+# reactphp-parallel-contracts
 
-[![Build Status](https://travis-ci.com/WyriHaximus/reactphp-parallel.png)](https://travis-ci.com/WyriHaximus/reactphp-parallel)
-[![Latest Stable Version](https://poser.pugx.org/WyriHaximus/react-parallel/v/stable.png)](https://packagist.org/packages/WyriHaximus/react-parallel)
-[![Total Downloads](https://poser.pugx.org/WyriHaximus/react-parallel/downloads.png)](https://packagist.org/packages/WyriHaximus/react-parallel)
-[![License](https://poser.pugx.org/wyrihaximus/react-parallel/license.png)](https://packagist.org/packages/wyrihaximus/react-parallel)
+[![Build Status](https://travis-ci.com/WyriHaximus/reactphp-parallel-contracts.png)](https://travis-ci.com/WyriHaximus/reactphp-parallel-contracts)
+[![Latest Stable Version](https://poser.pugx.org/WyriHaximus/react-parallel-contracts/v/stable.png)](https://packagist.org/packages/WyriHaximus/react-parallel-contracts)
+[![Total Downloads](https://poser.pugx.org/WyriHaximus/react-parallel-contracts/downloads.png)](https://packagist.org/packages/WyriHaximus/react-parallel-contracts)
+[![License](https://poser.pugx.org/wyrihaximus/react-parallel-contracts/license.png)](https://packagist.org/packages/wyrihaximus/react-parallel-contracts)
 
-ReactPHP bindings around ext-parallel
+Interfaces for ReactPHP ext-parallel related packages
 
 ## Install ##
 
 To install via [Composer](http://getcomposer.org/), use the command below, it will automatically detect the latest version and bind it with `~`.
 
 ```
-composer require wyrihaximus/react-parallel 
+composer require wyrihaximus/react-parallel-contracts 
 ```
 
+## Pools
+
+## Low level pools
+
+Low level pools only deal with executing closures on the Runtimes (threads) that make out the pools. And as such there 
+is only one low level pool and that is `Infinite`, which will, as the name suggest, scale infinitely. While you can use 
+such pools directly these are intended to be used by high level pools which have more control over what and how many 
+things you run on these threads.
+
+Low level pools have an additional feature where you can acquire a group lock that will prevent others from killing the 
+pool. The idea behind low level pools is that hey are never used directly be always by encapsulating high level pool. 
+Once all locks are released you can close/kill a low level pool.  
+
+## High level pools
+
 ## License ##
 
 Copyright 2019 [Cees-Jan Kiewiet](http://wyrihaximus.net/)