Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+## Code
+Fork the repository, make your changes, then create a pull request.
+
+## Translations
+### Weblate
+The project can be translated on [Weblate](https://hosted.weblate.org/engage/cartridges/).
+
+### Manually
+1. Clone the repository.
+2. If it isn't already there, add your language to `/po/LINGUAS`.
+3. Create a new translation from the `/po/cartridges.pot` file with a translation editor such as [Poedit](https://poedit.net/).
+4. Save the file as `[YOUR LANGUAGE CODE].po` to `/po/`.
+5. Create a pull request with your translations.
+
+# Building
+
+## GNOME Builder
+
+1. Download [GNOME Builder](https://flathub.org/apps/details/org.gnome.Builder).
+2. Click "Clone Repository" with `https://github.com/kra-mo/cartridges.git` as the URL.
+3. Click on the build button (hammer) at the top.
+
+## Meson
+```bash
+git clone https://github.com/kra-mo/cartridges.git
+cd cartridges
+meson setup build
+ninja -C build install
+```