add README

README.md

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+# ImageViewer
+The simple manga reader that is metadata aware.
+
+## Usage
+> [!WARNING]
+> This app can take a long time to start after adding new manga because of metadata generation.
+
+Create a folder for the manga and create a folder inside called volumes. Place your CBZ files inside volumes. 
+
+> [!NOTE]
+> The app does not regenerate the metadata file if it already exists, even if there are new volumes.
+
+When you first start the app, it will create a flatbuffer binary file with the metadata is has extracted from the entries in the zip.
+
+You can modify this file yourself if you want. I recommend converting to JSON, modifying it with a text editor, and the converting back.
+
+To convert the metadata file to JSON you can run a command similar to this:
+```sh
+flatc --json --defaults-json --raw-binary metadata.fbs -- metadata.fb
+```
+
+To convert back to binary you can run a command like this:
+```
+flatc --binary metadata.fbs metadata.json
+```
+
+Why do this?
+To set metadata that is not found in the filename such as chapter name, volume name and other things such as release date.