chore: add DevContainer config for GitHub codespaces (facebook#4003)

* devops: Docusaurus Dev Container

Signed-off-by: Kumar Aditya <[email protected]>

* formatted devcontainer.json

Co-authored-by: slorber <[email protected]>

Author: kumaraditya303

.devcontainer/devcontainer.json

@@ -0,0 +1,10 @@
+{
+  "name": "Docusaurus Dev Container",
+  "image": "mcr.microsoft.com/vscode/devcontainers/typescript-node:0-10-buster",
+  "settings": {
+    "terminal.integrated.shell.linux": "/bin/bash"
+  },
+  "extensions": ["dbaeumer.vscode-eslint"],
+  "forwardPorts": [3000],
+  "postCreateCommand": "yarn install"
+}