Update docs

Author: sciguy16

CHANGELOG.md

@@ -6,6 +6,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 ### Added
+* Added support for controlling basic RCX functions
 
 ### Changed
 

README.md

@@ -1,2 +1,32 @@
 # bricks
 CLI application for managing & flashing Lego programmable bricks
+
+## Supported features
+### Lego Powered Up
+* Scan for nearby Powered Up bricks
+
+### EV3
+(none yet)
+
+### NXT
+(none yet)
+
+### RCX
+* Liveness check and FW version reporting
+* (WIP) program download
+
+## Roadmap
+The following features are roughly somewhere on the roadmap:
+* RCX: program download
+* RCX: firmware download
+* RCX: program start/stop, send message
+* RCX: program compilation
+* NXT: connectivity check & version reporting
+* NXT: program download
+* NXT: firmware download
+* NXT: program start/stop, send message
+* NXT: program compilation
+* NXT: screen mirror
+* EV3: similar to NXT, but I don't currently own an EV3 brick
+* Powered Up: firmware download
+* Powered Up: discover connected peripherals