Initialisation README.md

1. Introduction
2. Installation
3. File structure
4. Module list (to finish)

README.md

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+### xdrm-framework
+
+#### Description
+xdrm-framework is a tool that wraps my framework and all it's component's versions. It allows to build a web framework's base with chosen modules and their versions.
+
+#### 1. Build a project
+To use the xdrm-framework's project builder, just open a linux terminal and type :
+
+1. `xdrm-framework modules` - to display the available modules
+2. `xdrm-framework enable {moduleName} 1.2` - to enable a module and its version (1.2 here)
+3. `xdrm-framework disable {moduleName}` - to disable a module
+4. `xdrm-framework build` - will create your project in the folder `built`
+5. `mv built {yourPath}/{yourProjectName}` - to move your project wherever you want 
+
+#### 2. Project's file structure
+xdrm-framework is based on `all is in config` so you will have this structure :
+- folder `build` which contains framework's modules.
+- folder `public_html` which contains visible content.
+- folder `config` which contains the modules' config files.
+- file `autoloader.php` which will auto-load the components.
+
+**Note:** In every php file you want to use framework's classes, you have to begin your file by :
+```php
+<?php
+      /* [1] dirname() as long as you're not at the project's root */
+      define('__ROOT__', dirname(dirname(__FILE__))); 
+      require_once __ROOT__.'/autoloader.php';
+      
+      /* [2] then you can load your classes */
+      use api\core\ModuleRequest;
+      use error\core\Error;
+      
+      /* [3] and use them as long as you want without namespace */
+      $request  = new ModuleRequest('module/method', ['id_user' => 10]);
+      $response = $request->dispatch();
+      
+      if( $response->error === Error::Success )
+          echo "All is going right!\n";
+```
+
+**Note:** Some global constants are created into the autoloader:
+- `__BUILD__` - The absolute `build` folder path
+- `__PUBLIC__` - The absolute `public_html` folder path
+- `__ROOT__` - The absolute `root` path (project root)
+- `__CONFIG__` - The absolute `config` folder path
+
+
+### 3. Modules
+
+#### [3.1] api - self-managed API 
+#### [3.2] error - error system
+#### [3.3] database - database wrapper and repository manager
+#### [3.4] orm - sql orm
+#### [3.5] router - apache2 router
+#### [3.6] lightdb - fast key-value storage