add readme

README.md

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-yii2-arangodb
-=============
+ArangoDb Extension for Yii 2
+===========================
 
-ArangoDB components for yii2 framework
+This extension provides the [ArangoDB](http://www.arangodb.org/) integration for the Yii2 framework.
+
+
+Installation
+------------
+
+This extension requires [ArangoDB PHP Extension](https://github.com/triAGENS/ArangoDB-PHP)
+
+The preferred way to install this extension is through [composer](http://getcomposer.org/download/).
+
+Either run
+
+```
+php composer.phar require --prefer-dist devgroup/yii2-arangodb "*"
+```
+
+or add
+
+```
+"devgroup/yii2-arangodb": "*"
+```
+
+to the require section of your composer.json.
+
+
+General Usage
+-------------
+
+To use this extension, simply add the following code in your application configuration:
+
+```php
+return [
+    //....
+    'components' => [
+        'arangodb' => [
+            'class' => '\devgroup\arangodb\Connection',
+            'connectionOptions' => [
+                ArangoConnectionOptions::OPTION_DATABASE => "mydatabase",
+                ArangoConnectionOptions::OPTION_ENDPOINT => 'tcp://127.0.0.1:8529',
+            ],
+        ],
+    ],
+];
+```
+
+Using the connection instance you may access databases, collections and documents.
+
+To perform "find" queries, you should use [[\devgroup\arangodb\Query]]:
+
+```php
+use devgroup\arangodb\Query;
+
+$query = new Query;
+// compose the query
+$query->select(['name', 'status'])
+    ->from('customer')
+    ->limit(10);
+// execute the query
+$rows = $query->all();
+```
+
+
+Using the MongoDB ActiveRecord
+------------------------------
+
+This extension provides ActiveRecord solution similar ot the [[\yii\db\ActiveRecord]].
+To declare an ActiveRecord class you need to extend [[\devgroup\arangodb\ActiveRecord]] and
+implement the `collectionName` and 'attributes' methods:
+
+```php
+use devgroup\arangodb\ActiveRecord;
+
+class Customer extends ActiveRecord
+{
+    /**
+     * @return string the name of the index associated with this ActiveRecord class.
+     */
+    public static function collectionName()
+    {
+        return 'customer';
+    }
+
+    /**
+     * @return array list of attribute names.
+     */
+    public function attributes()
+    {
+        return ['_key', 'name', 'email', 'address', 'status'];
+    }
+}
+```
+
+Note: collection primary key name ('_key') should be always explicitly setup as an attribute.
+
+You can use [[\yii\data\ActiveDataProvider]] with [[\devgroup\arangodb\Query]] and [[\devgroup\arangodb\ActiveQuery]]:
+
+```php
+use yii\data\ActiveDataProvider;
+use devgroup\arangodb\Query;
+
+$query = new Query;
+$query->from('customer')->where(['status' => 2]);
+$provider = new ActiveDataProvider([
+    'query' => $query,
+    'pagination' => [
+        'pageSize' => 10,
+    ]
+]);
+$models = $provider->getModels();
+```
+
+```php
+use yii\data\ActiveDataProvider;
+use app\models\Customer;
+
+$provider = new ActiveDataProvider([
+    'query' => Customer::find(),
+    'pagination' => [
+        'pageSize' => 10,
+    ]
+]);
+$models = $provider->getModels();
+```
+
+
+Using Migrations
+----------------
+
+ArangoDB migrations are managed via [[devgroup\arangodb\console\controllers\MigrateController]], which is an analog of regular
+[[\yii\console\controllers\MigrateController]].
+
+In order to enable this command you should adjust the configuration of your console application:
+
+```php
+return [
+    // ...
+    'controllerMap' => [
+        'arangodb-migrate' => 'devgroup\arangodb\console\controllers\MigrateController'
+    ],
+];
+```
+
+Below are some common usages of this command:
+
+```
+# creates a new migration named 'create_user_collection'
+yii arangodb-migrate/create create_user_collection
+
+# applies ALL new migrations
+yii arangodb-migrate
+
+# reverts the last applied migration
+yii arangodb-migrate/down
+```