Provide a good VSCode setup for contributors

.gitignore

@@ -10,5 +10,9 @@ npm-debug.log
 /website/src/relay/graphql
 /website/src/relay/prototyping
 .idea
-.vscode
+.vscode/* 
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
 .DS_Store

.vscode/extensions.json

@@ -0,0 +1,18 @@
+{
+	// See https://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations.
+	// Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
+
+	// List of extensions which should be recommended for users of this workspace.
+	"recommendations": [
+		"esbenp.prettier-vscode",
+		"dbaeumer.vscode-eslint",
+		"rust-lang.rust-analyzer",
+		"meta.relay",
+		"flowtype.flow-for-vscode"
+	],
+	// List of extensions recommended by VS Code that should not be recommended for users of this workspace.
+	"unwantedRecommendations": [
+		"rust-lang.rust",
+		"graphql.vscode-graphql"
+	]
+}

.vscode/settings.json

@@ -0,0 +1,23 @@
+{
+    // These conflict with Flow, so we must disable them.
+    "typescript.validate.enable": false,
+    "javascript.validate.enable": false,
+
+    "[javascript]": {
+      "editor.formatOnSave": true,
+      "editor.defaultFormatter": "esbenp.prettier-vscode"
+    },
+    "prettier.enable": true,
+
+
+    // Enable these to get Relay GraphQL editor support working on test files.
+    // This is also a good way to test changes that affect the compiler's LSP
+    // features.
+    //
+    // Note that startup will be very slow since it will need to build the
+    // compiler first.
+
+    // "relay.pathToConfig": "./scripts/config.tests.json",
+    // "relay.pathToRelay": "./scripts/dev-compiler.sh",
+    // "relay.autoStartCompiler": true,
+}