add vscode settings

.vscode/settings.json

+{
+    "restructuredtext.confPath": "${workspaceFolder}/docs",
+    "editor.formatOnSave": true,
+    "editor.defaultFormatter": "ms-python.python",
+    "python.formatting.blackArgs": [
+        "--line-length",
+        "79"
+    ],
+    "python.formatting.provider": "black"
+}