add license and readme

README.md

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+# grabit
+
+A simple script to take a screenshot, upload it to atums.world, and copy the link to the clipboard.
+
+## Requirements
+
+### Wayland
+- `grim`
+- `slurp`
+- `wl-copy`
+- `curl`, `jq`
+
+### X11
+- `flameshot`
+- `xclip`
+- `curl`, `jq`
+
+### Other
+- `xdg-utils`
+- Python 3
+
+## Setup
+
+Copy the `env.example` and change values, all are required but headers
+
+```bash
+cp .env.example .env
+```
+
+## Usage
+
+Take a screenshot and upload:
+```bash
+./upload.sh
+```
+
+Upload an existing file:
+```bash
+./upload.sh path/to/image.png
+```
+
+Upload clipboard image:
+```bash
+./upload.sh -c
+```
+
+## Notes
+- Detects Wayland/X11 automatically.
+- Copies the upload link to the clipboard.
+- Shows a preview of the uploaded image.
+
+## License
+[MIT](LICENSE)