Add gitignore and vscode build, test, and lint tasks configuration

Author: jrkb

.gitignore

@@ -0,0 +1,3 @@
+web-ext-artifacts/
+.git/
+.DS_Store

.vscode/tasks.json

@@ -0,0 +1,22 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Build",
+            "type": "shell",
+            "command": "web-ext build"
+        },
+        {
+            "label": "Test",
+            "type": "shell",
+            "command": "web-ext run"
+        },
+        {
+            "label": "Lint",
+            "type": "shell",
+            "command": "web-ext lint"
+        },
+    ]
+}