Create README.md

README.md

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+# cbr2cbz
+
+Convert a .cbr file to a .cbz file without modifying the original document.
+
+## Usage
+
+```bash
+cbr2cbz file1.cbr file2.cbr ...
+```
+
+**Convert all files in a directory**
+```bash
+cbr2cbz /path/to/comics/*.cbr
+cbr2cbz /path/to/comics/**/*.cbr
+```
+
+**Convert all files in a directory (multithreaded)**
+```bash
+find /path/to/comics/ -name '*.cbr' | parallel -j4 cbr2cbz {}
+```
+
+## Build from source
+```bash
+cmake .
+make
+```