Add VSCode recommendations

Author: Pelle Wessman

.gitignore

@@ -4,6 +4,7 @@
 /node_modules
 /.env
 /.nyc_output
+/.vscode
 
 # We're a library, so please, no lock files
 /package-lock.json
@@ -15,3 +16,4 @@
 !/lib/types/**/*.d.ts
 
 # Library specific ones
+!/.vscode/extensions.json

.vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+  "recommendations": [
+    "ryanluker.vscode-coverage-gutters",
+    "hbenl.vscode-test-explorer",
+    "hbenl.vscode-mocha-test-adapter",
+    "dbaeumer.vscode-eslint",
+    "gruntfuggly.todo-tree",
+    "editorconfig.editorconfig"
+  ]
+}