docs: Documentation and minor changes

README.md

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+# Papulastic image format
+
+Simple image format encoded/decoder and metadata extractor from file format from some random documentation from school.
+
+## How to use
+
+Just compile the binary 💀
+
+```bash
+cargo build --release
+```
+
+Or if you wanna be menace to society you can run `cargo run` everytime.
+
+## Encoding
+
+```bash
+papulastic-image-format encode --input INPUT -o OUTPUT
+```
+
+You can also include initials and custom signature
+
+```bash
+papulastic-image-format encode -i INPUT -o OUTPUT --initials JK --signature FALSE-BLINDNESS
+```
+
+## Decoding
+
+```bash
+papulastic-image-format decode -i INPUT -o OUTPUT.png
+```
+
+## Metadata
+
+```bash
+papulastic-image-format metadata -i INPUT
+```
+
+This code is not perfect but the documentation isn't too so I can't be bothered.