Added Dockerfile that runs the tests & VS code action

This will be how tests are executed locally

.vscode/tasks.json

@@ -0,0 +1,12 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "io_scene_psk_psa: test",
+            "type": "shell",
+            "command": "docker run -it --volume ${PWD}/io_scene_psk_psa:/addons/io_scene_psk_psa --volume ${PWD}/tests:/tests  $(docker build -q .)"
+        }
+    ]
+}