chore: unify issue templates (#686)

utilise the new GitHub issue templates for different kind of issues

Author: etabakov

.github/ISSUE_TEMPLATE.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):
+ - Node.js:
+ 
+ - [ ] Please, attach your package.json and webpack.config.js as these configurations are usually critical for investigating issues with webpack
+ 
+
+**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, 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/bug_report.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. -->