Automated documentation update [skip ci] (#7)

Co-authored-by: github-actions <github-actions@github.com>

Author: github-actions[bot]

src/gem/README.md

@@ -0,0 +1,26 @@
+
+# RubyGems (gem)
+
+Installs RubyGems using the gem cli
+
+## Example Usage
+
+```json
+"features": {
+    "ghcr.io/nulldriver/devcontainer-features/gem:1": {}
+}
+```
+
+## Options
+
+| Options Id | Description | Type | Default Value |
+|-----|-----|-----|-----|
+| gem | Name of gem(s) to install. Can be a single gem, or space/comma separated list of gems | string | - |
+| version | Specify version of gem to install | string | - |
+| prerelease | Allow prerelease versions of a gem to be installed. (Only for listed gems) | boolean | false |
+
+
+
+---
+
+_Note: This file was auto-generated from the [devcontainer-feature.json](https://github.com/nulldriver/devcontainer-features/blob/main/src/gem/devcontainer-feature.json).  Add additional notes to a `NOTES.md`._