Include note about using package.

README.md

@@ -72,3 +72,13 @@ The tools are also lint clean (save for line length lints which are useless driv
 ```
 flake8 --ignore E501 .
 ```
+
+## Including This Package
+
+By design, this code can be used as a library by other python code, and as it is Public Domain,
+it can be included wherever. I would prefer that you attribute me when possible, but it is not
+necessary. There is currently no PyPI package for arcadeutils, but if you clone the repo and
+run `pip install .` on the root, the package will be installed for you. Alternatively if you
+place the line `git+https://github.com/DragonMinded/arcadeutils.git@main#egg=arcadeutils` in your
+requirements file, then when you run `pip install -r requirements.txt` on your own code, the latest
+version of this package will be installed for you.