Updated docs and readme with Text Align (horizontal)

Author: jamiepollock

README.md

@@ -25,7 +25,7 @@ See [Usage documentation](docs/Usage.md).
 
 ### Content Alignment
 - [ ] Text / Content Alignment
-  - [ ] Horizontal
+  - [x] Horizontal
   - [ ] Vertical
 
 ### General

docs/Usage.md

@@ -120,4 +120,25 @@ Here are sample usages of the currently supported property editors. You are not
       "#808080"
     ]
   }
+```
+
+### Text Align
+
+ - **Typical CSS Property**: text-align
+ - **Supported values**:
+   - left
+   - right
+   - center
+   - justify
+ - **Editor**: Check Radio List
+
+```json
+...
+  {
+    "label": "Set text alignment",
+    "description": "Set text alignment",
+    "key": "text-align",
+    "view": "/App_Plugins/Our.Umbraco.GridSettings/editors/TextAlign/view.html"
+  }
+...
 ```