feat: add gam (#605)

Co-authored-by: Chris Rose <offline@offby1.net>

README.md

@@ -187,6 +187,7 @@ The `asdf` core provides a [security policy](https://github.com/asdf-vm/asdf/sec
 | fx                            | [wt0f/asdf-fx](https://gitlab.com/wt0f/asdf-fx)                                                                 | [![Build Status](https://gitlab.com/wt0f/asdf-fx/badges/main/pipeline.svg)](https://gitlab.com/wt0f/asdf-fx/-/pipelines)                                                                                                          |
 | fzf                           | [kompiro/asdf-fzf](https://github.com/kompiro/asdf-fzf)                                                         | [![Build Status](https://github.com/kompiro/asdf-fzf/workflows/plugin%20test/badge.svg)](https://github.com/kompiro/asdf-fzf/actions?query=workflow%3A%22plugin+test%22)                                                          |
 | Gauche                        | [sakuro/asdf-gauche](https://github.com/sakuro/asdf-gauche)                                                     | [![Build Status](https://travis-ci.org/sakuro/asdf-gauche.svg?branch=master)](https://travis-ci.org/sakuro/asdf-gauche)                                                                                                           |
+| gam                           | [offbyone/asdf-gam](https://github.com/offbyone/asdf-gam)                                                       | [![Build Status](https://github.com/offbyone/asdf-gam/workflows/ASDF%20CI/badge.svg)](https://github.com/offbyone/asdf-gam/actions)                                                                                               |
 | gcc-arm-none-eabi             | [dlech/asdf-gcc-arm-none-eabi](https://github.com/dlech/asdf-gcc-arm-none-eabi)                                 | [![Build](https://github.com/dlech/asdf-gcc-arm-none-eabi/actions/workflows/build.yml/badge.svg)](https://github.com/dlech/asdf-gcc-arm-none-eabi/actions/workflows/build.yml)                                                    |
 | gcloud                        | [jthegedus/asdf-gcloud](https://github.com/jthegedus/asdf-gcloud)                                               | [![Build](https://github.com/jthegedus/asdf-gcloud/workflows/Build/badge.svg?branch=master)](https://github.com/jthegedus/asdf-gcloud/actions)                                                                                    |
 | getenvoy                      | [asdf-community/asdf-getenvoy](https://github.com/asdf-community/asdf-getenvoy)                                 | [![Build Status](https://github.com/asdf-community/asdf-getenvoy/workflows/CI/badge.svg)](https://github.com/asdf-community/asdf-getenvoy/actions)                                                                                |

plugins/gam

@@ -0,0 +1 @@
+repository = https://github.com/offbyone/asdf-gam.git