Add clearInput method, add methods section into README

Author: temanmd

README.md

@@ -130,6 +130,7 @@ Change valueExtractor and pass the data to Autocomplete without fetchDataUrl
 
  name              | description                                   | type     | default
 :----------------- |:--------------------------------------------- | --------:|:------------------
+ ref               | Used to access component methods ("clearInput" for example)   |  RefObject | -
  autoCorrect       | Disable auto-correct                          |  Boolean | true
  keyboardType      | Input Keyboard Type                           |   String | default
  highlightText     | Highlight search results                      |  Boolean | true
@@ -170,6 +171,28 @@ Change valueExtractor and pass the data to Autocomplete without fetchDataUrl
  rightTextExtractor   | Extract value from item (args: item, index)   | Function | ({ value }) => value
  fetchData         | Fetch data for autocomplete                   | Function | -
 
+
+## Methods
+
+You can use methods through `ref` property:
+```javascript
+...
+const componentRef = useRef()
+<Autocomplete
+  ref={componentRef}
+  ...
+/>
+...
+componentRef.current.clearInput()
+```
+
+### Methods list
+
+ method            | description                                   | return
+:----------------- |:---------------------------------------------:|:-------
+ clearInput        | Clears input value                            | -
+
+
 ## Contributors ✨
 
 Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):

components/Autocomplete/index.js

@@ -26,6 +26,7 @@ class Autocomplete extends Component {
     this.handleInputChange = this.handleInputChange.bind(this);
     this.handleBlur = this.handleBlur.bind(this);
     this.promisifySetState = this.promisifySetState.bind(this);
+    this.clearInput = this.clearInput.bind(this);
   }
 
   handleInputChange(text) {
@@ -128,6 +129,10 @@ class Autocomplete extends Component {
     }
   }
 
+  clearInput() {
+    this.setState({inputValue: ""});
+  }
+
   componentDidMount() {
     const {data} = this.props;
     this.mounted = true;