Merge pull request #174 from renderforest/scale-doc

docs: add text scale setter doc to areas api.

Author: narekhovhannisyan

docs/project-data-api/AREAS_API.md

@@ -5,6 +5,7 @@
     - [Get recommended character count](#get-recommended-character-count)
   * [Setters](#setters)
     - [Set text](#set-text)
+      - [Set text scale](#set-text-scale)
     - [Set image](#set-image)
     - [Set video](#set-video)
 
@@ -48,6 +49,16 @@ Renderforest.getProjectData(15220886)
   })
 ```
 
+#### Set text scale
+
+It's possible to set text scale by percentage. The value must be between 80 and 120.
+```js
+projectDataInstance.getScreen(0)
+  .getArea(0)
+  .setText('sample-text')
+  .setTextScale(120)
+```
+
 ### Set image
 
 If area is `image`, then sets given image params, otherwise throws error.