meta(.vscode): add directory

Summary:
Add extensions and settings, and gitattributes.

Signed-off-by: Yongmin Hong <revi@omglol.email>

Test Plan: land it.

Reviewers: O1 revi & automations, revi

Reviewed By: O1 revi & automations, revi

Differential Revision: https://issuetracker.revi.xyz/D367

.arclint

@@ -18,7 +18,8 @@
     },
     "json": {
       "type": "json",
-      "include": ["(^\\.arcconfig$)", "(^\\.arclint$)", "(\\.json$)"]
+      "include": ["(^\\.arcconfig$)", "(^\\.arclint$)", "(\\.json$)"],
+      "exclude": ["(^.vscode/*.json$)"]
     },
     "merge-conflict": {
       "type": "merge-conflict"

.gitattributes

@@ -20,4 +20,5 @@
 # GitHub Linguist detection
 # https://github.com/github-linguist/linguist/blob/master/docs/overrides.md
 .arclint       linguist-language=json
+.vscode/*.json linguist-language=jsonc
 .yamllint      linguist-language=yaml

.vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+  "recommendations": [
+    "avive.arcanist",
+    "christian-kohler.npm-intellisense",
+    "editorconfig.editorconfig",
+    "esbenp.prettier-vscode",
+    "dbaeumer.vscode-eslint",
+    "github.vscode-github-actions"
+  ]
+}

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+  "files.associations": {
+    ".vscode/*.json": "jsonc"
+  }
+}