Added ISSUE_TEMPLATE.md

Author: ptomasroos

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,31 @@
+<!--
+  Thanks for reporting a issue!
+
+  In order to be able to help out I need you to provide a
+  reproduction repository on the exponent platform.
+  That means you should provide a reachable repository which reproduces the issue you're experiencing.
+
+  This will greatly improve the chance for you to get the bug fixed and me to be able to find it.
+-->
+
+- [ ] I have searched [existing issues](https://github.com/happypancake/react-native-tab-navigator/issues)
+- [ ] I am using the [latest react native tab navigator version](https://www.npmjs.org/package/react-native-tab-navigator)
+
+<!--
+  Describe your issue in detail.
+-->
+
+## Steps to Reproduce
+<!--
+  Required. Let us know how to reproduce the issue. Include a code sample or issue will be closed.
+-->
+
+## Expected Behavior
+<!--
+  Write what you thought would happen.
+-->
+
+## Actual Behavior
+<!--
+  Write what happened. Include screenshots if needed.
+-->