Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,35 @@
+---
+name: Bug report
+about: Help us improve react-native-date-picker
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is. 
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**To Reproduce**
+Add example code that reproduces the behavior. 
+```javascript
+export default class App extends Component {
+
+  state = { date: new Date() }
+
+  render = () =>
+    <DatePicker
+      date={this.state.date}
+      onDateChange={date => this.setState({ date })}
+    />
+
+}
+```
+
+**Smartphone (please complete the following information):**
+ - OS: [Android or iOS]
+ - React Native version [e.g. 0.59.4]
+ - react-native-date-picker version [e.g. 2.5.1]