added pr and issues template

Author: plamen5kov

.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.
+
+### 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"` property 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.
+Please provide us with the necessary information to reproduce your problem. That includes but is not limited to presenting us with steps to reproduce the problem, or a small repo example.
+

.github/PULL_REQUEST_TEMPLATE.md

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+Dear friend, we, the rest of the NativeScript community thank you for your
+contribution! Because we want to present a really nice, readable changelog with each
+release, please provide the following information:
+
+### Create a meaningful title
+Please, ensure your title is less than 50 characters and starts with a capital
+letter. We strive to follow the guidelines in the
+[How to Write a Git Commit Message] (http://chris.beams.io/posts/git-commit/)
+article for PR titles.
+
+### Does your commit message include the wording below to reference a specific issue in this repo?
+Fixes/Implements #[Issue Number].
+
+### Does your pull request have [unit tests](https://github.com/NativeScript/NativeScript/blob/master/running-tests.md)?
+If not, why?
+If not, please tell us why tests are not included, and list all steps needed to test your pull request manually.
+
+