update readme

README.md

@@ -4,8 +4,45 @@ This repository aims to add [Python](https://www.python.org) support to the famo
 The content of this repository is just work in progress at the moment.
 But the first working examples already look promising.
 
+## Requirements
+
+* [Git](https://git-scm.com/)
+* [Make](https://www.gnu.org/software/make/)
+* [uFBT](https://pypi.org/project/ufbt/) available in your `PATH` (or you have to adjust the [Makefile](./Makefile)
+* [Flipper Zero](https://flipperzero.one/) (tested with firmware version 0.99.1)
+
+For compiling MicroPython, you will also need:
+
+* [gcc](https://gcc.gnu.org/)
+* [Arm GNU Toolchain](https://developer.arm.com/Tools%20and%20Software/GNU%20Toolchain) (e.g. `gcc-arm-none-eabi` on Ubuntu)
+
 ## Setup
 
 ```bash
 git clone --recurse-submodules git@github.com:ofabel/mp-flipper.git
 ```
+
+## Build
+
+Since this application requires a 3th party library, more than just a simple `ufbt build` is needed to build the application:
+
+```bash
+make build
+```
+
+You can also build an launch the application on the attached Flipper Zero device in one command:
+
+```bash
+make launch
+```
+
+## Usage
+
+The application just starts with an open file browser.
+Here you can select any Python file to compile and execute from the SD card.
+
+## Disclaimer
+
+**This is work in progress and just a proof of concept.**
+The produced application has very limited functionality at the moment and since the whole application runs in the SRAM there is not much space left.
+However, the Python application itself can use about 16 kB of heap space (minus up to 2 kB for the stack).