feat: Add readOnly prop to TextInput docs and deprecate editable

Author: gabrieldonadel

docs/textinput.md

@@ -303,6 +303,8 @@ When `false`, if there is a small amount of space available around a text input
 
 ### `editable`
 
+> **Deprecated.** Use [`readOnly`](textinput#readonly) instead.
+
 If `false`, text is not editable. The default value is `true`.
 
 | Type |
@@ -625,6 +627,16 @@ The text color of the placeholder string.
 
 ---
 
+### `readOnly`
+
+If `true`, text is not editable. The default value is `false`.
+
+| Type |
+| ---- |
+| bool |
+
+---
+
 ### `returnKeyLabel` <div class="label android">Android</div>
 
 Sets the return key to the label. Use it instead of `returnKeyType`.