Add issue templates (#935)

Closes #928

Author: 9oelM

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,38 @@
+---
+name: Bug report
+about: Tell about typedoc's bug
+labels: bug
+---
+<!--
+    Thank you for contributing to Typedoc! 
+    
+    First, please use a clear and descriptive title for the issue to identify the bug.
+
+    Please be as specific as possible! Provide codes, sreenshots, repositories, explanations, issues, links ... anything that could describe your point.
+-->
+
+- [ ] I have checked [issues with bug label](https://github.com/TypeStrong/typedoc/labels/bug) and found no duplicates
+
+## Expected Behavior
+<!--
+    According to your expectations, how is Typedoc supposed to work?
+-->
+
+## Actual Behavior
+<!--
+    What does Typedoc fail to do?  
+-->
+
+## Steps to reproduce the bug
+<!--
+    Tell us how we could reproduce the bug. Possible ways are providing:
+    - Typedoc command (typedoc --out ...)
+    - Configuration (typedoc.js or your custom option file)
+    - Code that causes a bug in the documentation generated
+    - Project (Github repository, CodePen, ...) where the issue can be reproduced.
+-->
+
+## Environment
+  - Typedoc version:
+  - Node.js version:
+  - OS:

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,23 @@
+---
+name: Feature Request
+about: Suggest an improvement or a feature
+---
+<!--
+    Thank you for contributing to Typedoc! 
+    
+    First, please use a clear and descriptive title for the issue to identify the suggestion.
+    
+    Please be as specific as possible! Provide codes, screenshots, repositories, explanations, issues, links ... anything that could describe your point.
+-->
+
+- [ ] I have checked [issues with enhancement label](https://github.com/TypeStrong/typedoc/labels/enhancement) and found no duplicates
+
+## Problem
+<!--
+    What is missing or inconvenient without this improvement or feature?
+-->
+
+## Suggested Solution
+<!--
+    How do you suggest fixing the problem?
+-->