Add issue template

.github/ISSUE_TEMPLATE.md

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+## Please, provide the details below:
+
+### Did you verify this is a real problem by searching [Stack Overflow](http://stackoverflow.com/questions/tagged/nativescript)?
+_Yes/No_
+
+### Tell us about the problem
+_Please, ensure your title is less than 63 characters long and starts with a capital
+letter._
+
+### Which platform(s) does your issue occur on?
+_iOS/Android/Both (if applicable tell us the specific version of the platform)_
+
+### Please provide the following version numbers that your issue occurs with:
+- **Progress NativeScript UI version:** (the version of nativescript-telerik-ui/-pro in the `package.json`)
+- **CLI:** (run `tns --version` to fetch it)
+- **Cross-platform modules:** (the version of tns-core-modules in the `package.json`)
+- **Runtime(s):** (the `"tns-android"` and `"tns-ios"` properties in the `package.json`)
+
+### Please tell us how to recreate the issue in as much detail as possible.
+1. Start the application ..
+2. ...
+
+### Is there code involved? If so, please share the minimal amount of code needed to recreate the problem.
+_(You can paste entire code snippets or attach a runnable project)_