Debugging.md

+There is no `main.go` as simple entrypoint for the debugger, therefore you have to create a custom debugger config.
+
+This is an example for visual studio code, located at `.vscode/launch.json`.
+
+```json
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${workspaceFolder}/cmd/gosdn",
+            "env": {},
+            "args": []
+        }
+    ]
+}
+```
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