add script to prune designer files from migrations, add README with acknowledgements

README.md

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+# Foxnouns.NET
+
+Rewrite of pronouns.cc's codebase in C#, using Remix for the frontend.
+Still very work-in-progress, but a large portion of the backend is functional.
+
+## License
+
+    Copyright (C) 2024  sam <u1f320>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+## Acknowledgements
+
+Codebases I've used for inspiration/figuring things out:
+
+- [Iceshrimp.NET](https://iceshrimp.dev/iceshrimp/Iceshrimp.NET)
+- [PluralKit](https://github.com/PluralKit/PluralKit)
+
+Code taken entirely or almost entirely from external sources:
+
+- The functions in the `AddSids` migration,
+  taken from [PluralKit](https://github.com/PluralKit/PluralKit/blob/32a6e97342acc3b35e6f9e7b4dd169e21d888770/PluralKit.Core/Database/Functions/functions.sql)
+- `Foxnouns.Backend/Database/prune-designer-cs-files.sh`,
+  taken from [Iceshrimp.NET](https://iceshrimp.dev/iceshrimp/Iceshrimp.NET/src/commit/7c93dcf79dda54fc1a4ea9772e3f80874e6bcefb/Iceshrimp.Backend/Core/Database/prune-designer-cs-files.sh)