docs: updated readme

Author: JohnnyTheTank

README.md

@@ -1,29 +1,75 @@
 # bootstrap-block-grid
 real block grid for bootstrap
 
-# usage
-```html
-<div class="block-grid-xs-2 block-grid-sm-3 block-grid-md-4">
-    <div>
-        Content 1
-    </div>
-    <div>
-        Content 2
-    </div>
-    <div>
-        Content 3
-    </div>
-    <div>
-        Content 4
-    </div>
-    <div>
-        Content 5
-    </div>
-    <div>
-        Content 6
+Author: Jonathan Hornung ([JohnnyTheTank](https://github.com/JohnnyTheTank))
+
+## usage
+
+1. Install:
+    1. via [bower](http://bower.io/)
+        `bower install --save bootstrap-block-grid`
+
+    2. via downloaded files
+
+2. Add files to your html
+    1. when using bower
+    ```html
+    <script src="bower_components/bootstrap-block-grid/dist/bootstrap-block-grid.min.css"></script>
+    ```
+
+    2. when using downloaded files
+    ```html
+    <script src="bootstrap-block-grid.min.css"></script>
+    ```
+
+3. Sample Markup
+
+    ```html
+    <div class="block-grid-xs-2 block-grid-sm-3 block-grid-md-4">
+        <div>
+            Content 1
+        </div>
+        <div>
+            Content 2
+        </div>
+        <div>
+            Content 3
+        </div>
+        <div>
+            Content 4
+        </div>
+        <div>
+            Content 5
+        </div>
+        <div>
+            Content 6
+        </div>
     </div>
-</div>
-```
+    ```
+
+## available classes
+
+- *xs*
+    - `block-grid-xs-1`
+    - `block-grid-xs-2`
+    - ...
+    - `block-grid-xs-12`
+- *sm*
+    - `block-grid-sm-1`
+    - `block-grid-sm-2`
+    - ...
+    - `block-grid-sm-12`
+- *md*
+    - `block-grid-md-1`
+    - `block-grid-md-2`
+    - ...
+    - `block-grid-md-12`
+- *lg*
+    - `block-grid-lg-1`
+    - `block-grid-lg-2`
+    - ...
+    - `block-grid-lg-12`
+
 
 # licence
 MIT