Link to HashLink's documentation.

I'd forgotten that they have their own list of dependencies. And sure, we could copy their list, but I worry that we'd forget to update it. This way is easier and takes less space.
openfl · Aug 1, 2023 · c1cf271 · c1cf271
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diff --git a/project/README.md b/project/README.md
@@ -24,6 +24,7 @@ This directory contains two categories of code.
    ```bash
    sudo apt install libgl1-mesa-dev libglu1-mesa-dev g++ libasound2-dev libx11-dev libxext-dev libxi-dev libxrandr-dev libxinerama-dev libpulse-dev libxcursor-dev libdbus-1-dev libdrm-dev libgbm-dev libudev-dev
    ```
+- Building HashLink requires [additional packages](https://github.com/HaxeFoundation/hashlink#readme).
 
 ### Rebuilding
 Use `lime rebuild <target>` to build or rebuild a set of binaries. Once finished, you can find them in the [ndll directory](https://github.com/openfl/lime/tree/develop/ndll).