Add project details to README

README.md

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 # Weather-Panel-Display
 
-A weather display, based on an ESP32 and a 16x32 RGB led panel taken from a very pink electronic toy purse.
+A weather display, based on an ESP32 and a 16x32 RGB led panel taken from a very pink electronic toy purse.
+
+The panel is updated every 10 minutes with an icon of the current weather and the current temperature outside. Data is fetched using the DarkSky API.
+
+One boot, the unit will create a WiFi network with the name `ESP-XXXXXX`. When a user connects to that site, a capture portal will have a form requesting which WiFi network to use, and the DarkSky API key. After that, it will periodically update on its own.
+
+## Building
+
+This code compiles with the standard Arduino toolchain, and was tested with Arduino version 1.8.9.
+
+### Dependencies
+
+* ESP-32 SmartMatrix [Source](https://github.com/pixelmatix/SmartMatrix/tree/teensylc)
+* ArduinoJson [Homepage](https://arduinojson.org/), [Source](https://github.com/bblanchon/ArduinoJson)
+* ESP-32 WifiManager [Source](https://github.com/zhouhan0126/WIFIMANAGER-ESP32)
+
+
+## TODO
+
+No really, this has to be done before this code can be shared.
+
+- Add "Powered by DarkSky" text somewhere, per their [Terms of Service](https://darksky.net/dev/docs/terms#tos-attribution).
+
+## Future Work
+This was a hacky toy project, so I'll likely never implement the below, but there are is some low-hanging fruit without too much "scope creep".
+
+
+### Features
+
+- Add daily high/low temperatures
+- Add alternative icons with color
+- Add an option to persist the networking information
+
+### Usability
+
+- Show the WiFi network name on the LED display while waiting for configuration
+- Show an error on the LED display if the networking configuration is