Add readme

Author: ShadelessFox

README.md

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+# PlayStation Archive viewer
+
+A viewer for PlayStation Archive (PSARC) archives.
+
+![](https://github.com/user-attachments/assets/f1a1a042-70c9-480b-aa96-7d9e74f89697)
+
+## Installation
+
+1. Download the latest release from the [releases page](https://github.com/ShadelessFox/psarc/releases/latest) for your operating system
+2. Unzip the downloaded archive and launch using `psarc.exe` on Windows or `bin/psarc` on Linux
+
+#### Nightly builds
+
+If you want to try the latest features and improvements, you can download the latest build from the [actions page](https://github.com/ShadelessFox/psarc/actions).
+Click on the latest workflow run and download the artifact from the `Artifacts` section for your operating system.
+
+## Command Line
+
+### Listing files
+
+All files from an archive can be listed using the `list` command:
+
+```bash
+psarc-cli list path/to/archive.psarc
+```
+
+Additional options can be specified:
+
+- `--verbose` to make the output include offset, size, and compressed size of files within the archive,
+- `--output` to specify the output file (by default, outputs to the standard output).
+
+### Extracting files
+
+All files from an archive can be extracted using the `extract` command:
+
+```bash
+psarc-cli extract --dir path/to/output path/to/archive.psarc
+```