Add docs

README.md

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+# RGBCube's Homepage
+
+The official website and link portal of RGBCube and his work.
+
+## Building
+
+The repository can be built using Nix, simply run:
+
+```
+nix build
+```
+
+and the site contents will be under the `result/` symlink.
+
+If you don't have Nix, you can use Deno by itself instead:
+
+```
+deno task build
+```
+
+and the site contents will be under the `_site/` directory.
+
+## License
+
+All the human writing (non-HTML and not templating related) under the `site/`
+directory is licensed under [CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/).
+
+The other HTML and templating code is licensed under the GPU General Public License (`LICENSE_GPL.md`):
+
+```
+Copyright (C) 2023-present  RGBCube
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+```