Update RNLineEdit.ts (#293)

LineEdit example

Author: Greg B

src/components/LineEdit/RNLineEdit.ts

@@ -8,6 +8,27 @@ import { ViewProps, setViewProps } from "../View/RNView";
 import { RNWidget } from "../config";
 import { throwUnsupported } from "../../utils/helpers";
 
+ /**
+ * The LineEdit component provides ability to add and manipulate native editable text field widgets. It is based on
+ * [NodeGui's QLineEdit](https://docs.nodegui.org/docs/api/generated/classes/qlineedit).
+ * ## Example
+ * ```javascript
+ * import React from "react";
+ * import { Renderer, LineEdit, Window } from "@nodegui/react-nodegui";  
+ * const App = () => {
+ *   const handleTextChanged = textValue => {
+ *    console.log(textValue);
+ *   };
+ *   return (
+ *     <Window>
+ *      <LineEdit on={{ textChanged: handleTextChanged }} />
+ *    </Window>
+ *   );
+ * };
+ * Renderer.render(<App />);
+ * 
+ * ```
+ */
 export interface LineEditProps extends ViewProps<QLineEditSignals> {
   text?: string;
   placeholderText?: string;