Update issue templates

Added issue templates for:
- Bugs
- Feature requests
- Syntax highlighting

Author: gnikit

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,35 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Code sample**
+If applicable, provide the code that caused the extension to break.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Build info (please complete the following information):**
+ - OS: [e.g. Linux x64]
+ - Extension Version [e.g. 2.4.0]
+ - Visual Studio Code Version [e.g. 1.62.0]
+
+**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
+title: ''
+labels: feature-request
+assignees: ''
+
+---
+
+**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/ISSUE_TEMPLATE/syntax-highlighting.md

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+---
+name: Syntax highlighting
+about: Create a bug report for erroneous syntax highlighting
+title: ''
+labels: syntax-highlight
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Screenshots**
+Add screenshots to help explain your problem.
+
+**Code sample**
+Provide the code that caused the extension to break.
+See Wikipedia for how to write a [Minimal Working Example](https://en.wikipedia.org/wiki/Minimal_working_example)
+
+**To Reproduce**
+If applicable, steps to reproduce the behavior
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Fortran Form**
+Free form (F90+) or Fixed Form (F77)
+
+**Build info (please complete the following information):**
+ - OS: [e.g. Linux x64]
+ - Extension Version [e.g. 2.4.0]
+ - Visual Studio Code Version [e.g. 1.62.0]
+
+**Additional context**
+Add any other context about the problem here.