Add formatting script for GitHub Actions and add GitHub metadata

.github/FUNDING.yml

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+patreon: godotengine
+custom: https://godotengine.org/donate

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Report a bug with the extension.
+title: ''
+labels: bug
+assignees: neikeq
+
+---
+
+<!--
+Please search existing issues for potential duplicates before filing yours:
+https://github.com/godotengine/godot-csharp-visualstudio/issues?q=is%3Aissue
+
+Only submit an issue if it is reproducible with the latest stable Godot version.
+-->
+
+**OS/device including version:**
+<!-- Specify GPU model and drivers if graphics-related. -->
+
+
+**Issue description:**
+<!-- What happened, what was expected, and what went wrong. -->
+
+
+**Screenshots of issue:**
+<!--
+This section is optional.
+Drag in an image, or post an image with a link in the form of:
+![Alt Text Here](https://pbs.twimg.com/media/DW5AJnZVAAM1805?format=jpg)
+-->

.github/ISSUE_TEMPLATE/feature---enhancement-request.md

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+---
+name: Feature / Enhancement Request
+about: Adding new features or improving existing ones.
+title: ''
+labels: enhancement
+assignees: neikeq
+
+---
+
+<!--
+Please search existing issues for potential duplicates before filing yours:
+https://github.com/godotengine/godot-csharp-visualstudio/issues?q=is%3Aissue
+-->

.github/workflows/ci.yml

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+name: Continuous integration
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Lint extension
+        run: |
+          sudo apt-get update -qq
+          sudo apt-get install -qq dos2unix recode
+          bash ./format.sh