Update README.md

Author: efoft

README.md

@@ -5,21 +5,16 @@ Also there is the method to get all binded values for such substitutors.
 
 ### Installation
 ------
-The package is intended to be used via Composer. It currently is not on Packagist, so add this repository description to you composer.json:
-```
-    "repositories": [
-        {
-            "type": "vcs",
-            "url": "https://github.com/efoft/query-builder"
-        },
-    ]
-```
-and require it:
+The package is intended to be used via Composer. Add this to you composer.json:
 ```
     "require": {
         "efoft/query-builder" : "dev-master"
     }
 ```
+or just run via command-line:
+```
+composer require efoft/query-builder
+```
 
 ### Initialization
 ------
@@ -64,15 +59,16 @@ Examples below illustrate it in more details.
 #### Select
 Method ->select(). Can chain and can be called multiple times. Duplicates are automatically removed.
 For specifying aliases use associative arrays: array('field'=>'alias', ...).
-The following methods allow to set ORDER BY, GROUP BY and LIMIT
+The following methods allow to set ORDER BY, GROUP BY, LIMIT and DISTINCT directives:
   * order()
   * group()
   * limit()
+  * distinct()
 
 ```
 // select
 $q->from('table1,  table2 ')->from('table2')->select(array('table2.age'=>'a','table1.name'=>'n'))->where(array('id'=>13));
-$q->where(array('age'=>'/3.*/'))->order('name')->limit(100);
+$q->where(array('age'=>'/3.*/'))->order('name')->limit(100)->distinct();
 echo $q->getQuery() . PHP_EOL;
 echo print_r($q->getBindings()) . PHP_EOL;
 
@@ -137,6 +133,13 @@ Array
     [id] => 13
 )
 ```
+#### Join
+Method ->join(). It has 3 mandatory arguments (joined table, key field in main table, key fields in joined table) and 1 optional - type of join (by default LEFT is used). For key fields there is no need to specify them as fully-qualified, it's done automatically. Join is applicable to select, update and delete statements and can be run multiple time if many tables are joined.
+```
+$q->from('table1')->select(array('table1.age'=>'a','table1.name'=>'n'))->order('n')->limit(100);
+$q->join('tags','id','relid')->join('imgs','id','relid')->distinct();
+$q->where(array('$or'=>array(array('tags.value'=>'three'),array('imgs.value'=>'image1.png'))));
+```
 
 #### Retrieve results
 To get resulted query:
@@ -147,4 +150,4 @@ $sql = $q->getQuery();
 To get binded values:
 ```
 $values = $q->getBindings()'
-```
+```