new: Added a README

README.md

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+# Cambridge Core Merge
+
+This is a python script to merge books downloaded from Cambridge Core into a single PDF file.
+
+## Installation
+```bash
+uv tool install git+https://github.com/SinTan1729/cambridge-core-merge
+```
+
+## Usage
+```bash
+cambridge-core-merge [-h] -z ZIPFILE -n NAME [-c COVER]
+```
+Available options:
+```bash
+  -h, --help            show this help message and exit
+  -z, --zipfile ZIPFILE
+                        The path of the zip file obtained from Cambridge Core.
+  -n, --name NAME       The path of the final PDF file.
+  -c, --cover COVER     The path of the cover file. (Must be JPG.)
+```
+