Add 1.21 to versions table

Author: sciwhiz12

docs/getting-started.md

@@ -11,6 +11,7 @@ The latest version of the release export for a particular Minecraft version can
 
 | Minecraft Version | Mappings Version |
 |:-----------------:|:----------------:|
+| **1.21** | ![Latest release version badge for 1.20.6](https://img.shields.io/maven-metadata/v?color=forestgreen&label=release&metadataUrl=https%3A%2F%2Fldtteam.jfrog.io%2Fartifactory%2Fparchmentmc-internal%2Forg%2Fparchmentmc%2Fdata%2Fparchment-1.21%2Fmaven-metadata.xml) |
 | **1.20.6** | ![Latest release version badge for 1.20.6](https://img.shields.io/maven-metadata/v?color=forestgreen&label=release&metadataUrl=https%3A%2F%2Fldtteam.jfrog.io%2Fartifactory%2Fparchmentmc-internal%2Forg%2Fparchmentmc%2Fdata%2Fparchment-1.20.6%2Fmaven-metadata.xml) |
 | **1.20.4** | ![Latest release version badge for 1.20.4](https://img.shields.io/maven-metadata/v?color=forestgreen&label=release&metadataUrl=https%3A%2F%2Fldtteam.jfrog.io%2Fartifactory%2Fparchmentmc-internal%2Forg%2Fparchmentmc%2Fdata%2Fparchment-1.20.4%2Fmaven-metadata.xml) |
 | **1.20.3** | ![Latest release version badge for 1.20.3](https://img.shields.io/maven-metadata/v?color=forestgreen&label=release&metadataUrl=https%3A%2F%2Fldtteam.jfrog.io%2Fartifactory%2Fparchmentmc-internal%2Forg%2Fparchmentmc%2Fdata%2Fparchment-1.20.3%2Fmaven-metadata.xml) |