Create README.md

Author: ydajiang

README.md

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+# Go Audio Transcoder
+
+A audio transcoding library for Go, supporting AAC, Opus and G.711 codecs.
+
+## Features
+
+- **Multi-codec Support**:
+  - AAC encoding/decoding
+  - Opus encoding/decoding
+  - G.711 A-law/μ-law encoding/decoding
+
+- **Cross-platform**:
+  - Windows/Linux support via CGO
+    
+## Installation
+
+```bash
+go get github.com/lkmio/audio-transcoder