Add Golden Tests

Author: AhmedLSayed9

.gitignore

@@ -73,3 +73,6 @@ build/
 !**/ios/**/default.mode2v3
 !**/ios/**/default.pbxuser
 !**/ios/**/default.perspectivev3
+
+# don't check in golden failure output
+**/failures/*.png

.vscode/launch.json

@@ -0,0 +1,17 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Golden",
+      "request": "launch",
+      "type": "dart",
+      "codeLens": {
+        "for": ["run-test", "run-test-file"]
+      },
+      "args": ["--update-goldens"]
+    }
+  ]
+}