Code guide for new contributors

Description for daemon, CLI and UI

contribution.md

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+# Contribution
+
+### Code Structure
+
+The codebase is structured in 3 big components:
+* Client
+* Server
+* Signal
+* Dashboard (separate [repository](https://github.com/netbirdio/dashboard))
+
+---
+
+### CLIENT
+The Client consists of three different components.
+
+##### Daemon
+
+```
+client/server     # daemon server that runs in the background
+client/proto      # grpc daemon server listening to either the CLI or UI for requests
+management/client # grpc client that connects to the management server
+```
+The Daemon runs in the background, and keeps the connection running.
+
+##### CLI 
+We use [Cobra](https://github.com/spf13/cobra) as our CLI framework
+```
+client/cmd          # All CLI commands are defined and implemented here
+client/cmd/root.go  # All commands are registered in root.go
+```
+
+##### UI-App
+We use [systray](https://github.com/getlantern/systray) and [fyne](https://github.com/fyne-io/fyne) to write a UI application for the Systemtray.
+```
+client/ui       #  
+```
+
+
+---
+### MANAGEMENT
+
+
+
+---
+### SIGNAL
+
+
+---
+### DASHBOARD