Create ISSUE_TEMPLATE

.github/ISSUE_TEMPLATE.md

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+Dear friend, we, the rest of the NativeScript community really
+appreciate your feedback! While we are doing all we can to take care of every
+issue, sometimes we get overwhelmed. Because of that, we will consider issues
+that are not constructive or problems that cannot be reproduced "dead".
+Additionally, we will treat feature requests or bug reports with unanswered
+questions regarding the behavior/reproduction for more than 20 days "dead". All
+"dead" issues will get closed.
+
+## Please, provide the details below:
+
+### Did you verify this is a real problem by searching [Stack Overflow](http://stackoverflow.com/questions/tagged/nativescript) and the [other open issues in this repo](https://github.com/NativeScript/nativescript/issues)?
+
+### 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
+
+### Please provide the following version numbers that your issue occurs with:
+- CLI: (run `tns --version` to fetch it)
+- Cross-platform modules: (check the 'version' attribute in the
+`node_modules/tns-core-modules/package.json` file in your project)
+- Runtime(s): (look for the `"tns-android"` and `"tns-ios"` properties in the
+`package.json` file of your project)
+- Plugin(s): (look for the version number in the `package.json` file of your
+project)
+
+### Please tell us how to recreate the issue in as much detail as possible.
+
+### Is there code involved? If so, please share the minimal amount of code needed to recreate the problem.
+