chore: unify issue templates (#206)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: 'We really appreciate your effort to provide feedback. Before opening a new
+  issue, please make sure that this case is not already reported in GitHub as an
+  issue or in StackOverflow as a question.'
+
+---
+
+**Environment**
+Provide version numbers for the following components (information can be retrieved by running `tns info` in your project folder or by inspecting the `package.json` of the project):
+ - CLI: 
+ - Cross-platform modules:
+ - Android Runtime:
+ - iOS Runtime:
+ - Plugin(s):
+
+**Describe the bug**
+<!-- A clear and concise description of what the bug is. Please, explain whether it's a build time error or a runtime error. More detailed logs can be easily obtained by following the instructions in this guide: https://docs.nativescript.org/get-support#how-to-obtain-diagnostic-reports. -->
+
+**To Reproduce**
+<!-- Add commands used or steps taken to reproduce the behaviour. -->
+
+**Expected behavior**
+
+**Sample project**
+<!-- If possible, provide a link from the [Playground](https://play.nativescript.org) with reproduction of the problem. If not, consider attaching a sample project or link to a repository with such project. -->
+
+**Additional context**
+<!-- Add any other context about the problem here. -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+<!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]. --> 
+
+**Describe the solution you'd like**
+<!-- A clear and concise description of what you want to happen. -->
+
+**Describe alternatives you've considered**
+<!-- A clear and concise description of any alternative solutions or features you've considered. -->
+
+**Additional context**
+<!-- Add any other context or screenshots about the feature request here. -->

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+We, the rest of the NativeScript community, thank you for your
+contribution! 
+To help the rest of the community review your change, please follow the instructions in the template.
+-->
+
+<!-- PULL REQUEST TEMPLATE -->
+<!-- (Update "[ ]" to "[x]" to check a box) -->
+
+## PR Checklist
+
+- [ ] The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
+- [ ] There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
+- [ ] You have signed the [CLA](http://www.nativescript.org/cla).
+- [ ] All existing tests are passing: https://github.com/NativeScript/NativeScript/blob/master/DevelopmentWorkflow.md#running-unit-tests.
+- [ ] Tests for the changes are included - https://github.com/NativeScript/NativeScript/blob/master/WritingUnitTests.md.
+
+## What is the current behavior?
+<!-- Please describe the current behavior that you are modifying, or link to a relevant issue. -->
+
+## What is the new behavior?
+<!-- Describe the changes. -->
+
+Fixes/Implements/Closes #[Issue Number].
+
+<!-- If this PR contains a breaking change, please describe the impact and migration path for existing applications below. -->
+
+<!-- 
+BREAKING CHANGES:
+
+
+[Describe the impact of the changes here.]
+
+Migration steps:
+[Provide a migration path for existing applications.]
+-->
+