Create README.md for Pyxis project

Add initial README with project description and features

README.md

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+# Pyxis
+An LXMF client firmware for T-Deck
+Very much WIP, don't expect stability :) 
+
+## Features
+Reticulum transport over: 
+- RNode-compatible LoRa
+- AutoInterface (local wifi)
+- TCP Client
+- BLE Interface (barely working if at all)
+- GPS-synced time
+- One really annoying beep when you get a new message (user toggle)
+- View the announce stream
+- Choose a propagation node (and sycn with it)
+- Set auto announce timer
+- Light up keyboard (user toggle)