Better README

README.md

@@ -1,8 +1,44 @@
 # TagLib statically cross-compiled
 
-[![Last Release](https://img.shields.io/github/v/release/navidrome/cross-taglib?logo=github&label=latest&style=flat-square)](https://github.com/navidrome/cross-taglib/releases)
 ![Build](https://img.shields.io/github/actions/workflow/status/navidrome/cross-taglib/ci.yml?branch=main&logo=github&style=flat-square)
-[![TagLib](https://img.shields.io/badge/dynamic/toml?url=https%3A%2F%2Fraw.githubusercontent.com%2Fnavidrome%2Fcross-taglib%2Fmaster%2F.version&query=%24.TAGLIB_VERSION&label=TagLib&color=brightgreen)](https://github.com/taglib/taglib/releases)
+[![Last Release](https://img.shields.io/github/v/release/navidrome/cross-taglib?logo=github&label=latest&style=flat-square)](https://github.com/navidrome/cross-taglib/releases)
+
+## Purpose
+
+This repository provides a statically cross-compiled version of [TagLib](https://taglib.org), a library for reading and 
+editing metadata of several popular audio formats. This project requires [Docker or Docker Desktop](https://docker.com) 
+to work locally
+
+## Supported platforms
+This table shows the platforms and architectures supported by this project. To build for a specific platform, use 
+the `make build` command with the `PLATFORM` variable set to the desired platform
+
+| Platform      | Param to `make` |
+|---------------|-----------------|
+| Linux AMD64   | linux/amd64     |
+| Linux 386     | linux/386       |
+| Linux ARM64   | linux/arm64     |
+| Linux ARMv7   | linux/arm/v7    |
+| Linux ARMv6   | linux/arm/v6    |
+| Linux ARMv5   | linux/arm/v5    |
+| Windows AMD64 | windows/amd64   |
+| Windows 386   | windows/386     |
+| macOS AMD64   | darwin/amd64    |
+| macOS ARM64   | darwin/arm64    |
+
+
+## Tasks
+
+### Build locally
+
+- `make build` - Will build for all supported platforms
+- `make build PLATFORM=linux/amd64` - Will build for a specific platform
+- `make update` - Will update the TagLib version in the `.version` file
+
+### Release
+
+To release a new version, just push a new tag in the format `vX.Y.Z-I`.  This will trigger a GitHub Actions workflow that 
+will build and release the binaries for all supported platforms.
 
-This repository contains a Dockerfile to build a statically cross-compiled version of [TagLib](https://taglib.org) for 
-multiple platforms.
+The version represents the TagLib version + a counter. For example, `v2.0.2-1` represents the first release based on 
+TagLib 2.0.2.