Fully-automate development setup with Gitpod

.gitpod.yml

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+tasks:
+  - init: |
+      yarn
+    command: |
+      yarn start
+
+ports:
+  - port: 3000
+    onOpen: open-preview
+    visibility: private
+
+github:
+  prebuilds:
+    # enable for the master/default branch (defaults to true)
+    master: true
+    # enable for all branches in this repo (defaults to false)
+    branches: true
+    # enable for pull requests coming from this repo (defaults to true)
+    pullRequests: true
+    # enable for pull requests coming from forks (defaults to false)
+    pullRequestsFromForks: true
+    # add a check to pull requests (defaults to true)
+    addCheck: true
+    # add a "Review in Gitpod" button as a comment to pull requests (defaults to false)
+    addComment: true
+    # add a "Review in Gitpod" button to the pull request's description (defaults to false)
+    addBadge: true
+    # add a label once the prebuild is ready to pull requests (defaults to false)
+    addLabel: true

CONTRIBUTING.md

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+## Hacking on Beatmapper in Gitpod
+
+If you have a web browser, you can get a fully pre-configured development environment with one click:
+
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)

README.md

@@ -1,3 +1,5 @@
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)
+
 # Beatmapper
 
 ## A 3D editor for creating Beat Saber maps