Add Visual Studio Code debug configuration for bqetl. (#3395)

.vscode/launch.json.default

@@ -0,0 +1,20 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "bqetl",
+            "type": "python",
+            "request": "launch",
+            "program": "${workspaceFolder}/venv/bin/bqetl",
+            "args": "${input:bqetl_args}",
+            "justMyCode": true
+        }
+    ],
+    "inputs": [
+        {
+            "id": "bqetl_args",
+            "type": "promptString",
+            "description": "bqetl args"
+        }
+    ]
+}

README.md

@@ -57,6 +57,7 @@ venv/bin/pip-sync --pip-args=--no-deps requirements.txt <(echo mozilla-bigquery-
 Finally, if you are using Visual Studio Code, you may also wish to use our recommended defaults:
 ```bash
 cp .vscode/settings.json.default .vscode/settings.json
+cp .vscode/launch.json.default .vscode/launch.json
 ```
 
 And you should now be set up to start working in the repo! The easiest way to do this is for many tasks is to use [`bqetl`](https://mozilla.github.io/bigquery-etl/bqetl/). You may also want to read up on [common workflows](https://mozilla.github.io/bigquery-etl/cookbooks/common_workflows/).