Add VS code config for running tests on a file

Author: tobiasdiez

.vscode/launch.json

@@ -8,6 +8,17 @@
             "program": "${file}",
             "console": "integratedTerminal",
             "justMyCode": false
+        },
+        {
+            "name": "Sage: Test",
+            "type": "python",
+            "request": "launch",
+            "program": "${workspaceFolder}/src/bin/sage-runtests",
+            "args": [
+                "${file}"
+            ],
+            "console": "integratedTerminal",
+            "justMyCode": false
         }
     ],
 }