Add very basic README.

README.md

@@ -0,0 +1,18 @@
+# power-fv
+
+(TODO)
+
+## Prerequisites
+
+- Python 3.8+
+- [Yosys](https://github.com/YosysHQ/yosys)
+- [SymbiYosys (sby)](https://github.com/YosysHQ/sby)
+
+## Installation
+
+```python3
+pip3 install poetry --user
+poetry install
+```
+
+See the `cores` folder for usage examples.

cores/microwatt/README.md

@@ -1,11 +1,11 @@
-Requirements:
-- amaranth
-- yosys
-- ghdl
-- ghdl-yosys-plugin
-- sby
+## Additional prerequisites
+
+- [ghdl](https://github.com/ghdl/ghdl) with the LLVM or GCC backend
+- [ghdl-yosys-plugin](https://github.com/ghdl/ghdl-yosys-plugin)
+
+## Usage
 
 ```shell
 git clone https://github.com/antonblanchard/microwatt
-python run.py
+poetry run python ./run.py
 ```