Update README to mention checking out submodules.

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Catherine 2025-01-28 03:07:57 +00:00 committed by GitHub
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@ -54,6 +54,12 @@ of the selected architecture:
Getting started
---------------
First of all, run:
```
git submodule update --init --recursive
```
### nextpnr-ice40
For iCE40 support, install [Project IceStorm](https://github.com/YosysHQ/icestorm) to `/usr/local` or another location, which should be passed as `-DICESTORM_INSTALL_PREFIX=/usr` to CMake. Then build and install `nextpnr-ice40` using the following commands: