feat: add markdownlint-cli2 plugin (#849)

Co-authored-by: James Hegedus <jthegedus@hey.com>

Author: paulo-ferraz-oliveira

README.md

@@ -434,6 +434,7 @@ The `asdf` core provides a [security policy](https://github.com/asdf-vm/asdf/sec
 | make                          | [yacchi/asdf-make](https://github.com/yacchi/asdf-make)                                                         | [![Build Status](https://github.com/yacchi/asdf-make/actions/workflows/build.yml/badge.svg)](https://github.com/yacchi/asdf-make/actions?query=workflow%3ABuild)                                                                  |
 | mani                          | [anweber/asdf-mani](https://github.com/anweber/asdf-mani)                                                       | [![Build Status](https://github.com/anweber/asdf-mani/actions/workflows/build.yml/badge.svg)](https://github.com/anweber/asdf-mani/actions?query=workflow%3ABuild)                                                                |
 | mark                          | [jfreeland/asdf-mark](https://github.com/jfreeland/asdf-mark)                                                   | [![Build Status](https://github.com/jfreeland/asdf-mark/workflows/build/badge.svg)](https://github.com/jfreeland/asdf-mark/actions?query=workflow%3Abuild)                                                                        |
+| markdownlint-cli2             | [paulo-ferraz-oliveira/asdf-markdownlint-cli2](https://github.com/paulo-ferraz-oliveira/asdf-markdownlint-cli2) | [![Build Status](https://github.com/paulo-ferraz-oliveira/asdf-markdownlint-cli2/actions/workflows/build.yml/badge.svg?branch=main)](https://github.com/paulo-ferraz-oliveira/asdf-markdownlint-cli2/actions)                     |
 | marp-cli                      | [xataz/asdf-marp-cli](https://github.com/xataz/asdf-marp-cli)                                                   | [![Build](https://github.com/xataz/asdf-marp-cli/actions/workflows/workflow.yml/badge.svg)](https://github.com/xataz/asdf-marp-cli/actions/workflows/workflow.yml)                                                                |
 | mask                          | [aaaaninja/asdf-mask](https://github.com/aaaaninja/asdf-mask)                                                   | [![Build Status](https://github.com/aaaaninja/asdf-mask/actions/workflows/build.yml/badge.svg)](https://github.com/aaaaninja/asdf-mask/actions/workflows/build.yml)                                                               |
 | Maven                         | [halcyon/asdf-maven](https://github.com/halcyon/asdf-maven)                                                     | [![Build Status](https://travis-ci.org/halcyon/asdf-maven.svg?branch=master)](https://travis-ci.org/halcyon/asdf-maven)                                                                                                           |

plugins/markdownlint-cli2

@@ -0,0 +1 @@
+repository = https://github.com/paulo-ferraz-oliveira/asdf-markdownlint-cli2