docs : add README

README.md

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+# UEFI-Video
+Media renderer embedded in UEFI boot environment
+
+## Features
+- Render GIF
+- Render PNG
+
+## Requirements
+- Rust toolchain
+- Appropriate rust target
+
+## Build
+```bash
+cargo build --target x86_64-unknown-uefi --release
+# result: uefi-video.efi
+```
+
+## Test Info
+Tested on:
+- `x86_64-unknown-uefi`