Recognize Azure DevOps files appropriately

Author: andyleejordan

.vscode/extensions.json

@@ -4,6 +4,7 @@
   "recommendations": [
     "editorconfig.editorconfig",
     "msjsdiag.debugger-for-chrome",
+    "ms-azure-devops.azure-pipelines",
     "ms-vscode.powershell",
     "ms-vscode.vscode-typescript-tslint-plugin",
     "davidanson.vscode-markdownlint"

extension-dev.code-workspace

@@ -9,7 +9,8 @@
     ],
   "settings": {
     "files.associations": {
-      "**/snippets/*.json": "jsonc"
+      "**/snippets/*.json": "jsonc",
+      "**/.vsts-ci/**/*.yml": "azure-pipelines",
     },
     "typescript.tsdk": "./node_modules/typescript/lib"
   }