Add the milestone plugin

README.md

@@ -8,12 +8,13 @@ Kanban project management software, plus a set of plugins which extend its
 functionality and also integrate it with other systems.
 
 ```mermaid
-graph TD
+graph LR
     style kanboard fill:#606096,color:#fff
     style gantt_plugin fill:#46A046,color:#fff
     style saml_plugin fill:#46A046,color:#fff
     style export_plugin fill:#46A046,color:#fff
     style wbs_plugin fill:#46A046,color:#fff
+    style milestone_plugin fill:#46A046,color:#fff
 
     saml_idp("SAML IDP")
 
@@ -22,11 +23,13 @@ graph TD
     saml_plugin("SAML Plugin")
     export_plugin("Export Plugin")
     wbs_plugin("Work Breakdown Structure Plugin")
+    milestone_plugin("Milestone Plugin")
 
     kanboard --> gantt_plugin
     kanboard --> saml_plugin
     kanboard --> export_plugin
     kanboard --> wbs_plugin
+    kanboard --> milestone_plugin
     saml_plugin --> saml_idp
 ```
 
@@ -35,3 +38,4 @@ graph TD
 * [Gantt Chart Plugin](https://gitlab.tugraz.at/dbp/plan/plan-plugin-ganttPlan) - Shows your tasks in a Gantt chart
 * [Export Plugin](https://gitlab.tugraz.at/dbp/plan/plan-plugin-exportPlan) - Allows you to export your tasks in a variety of forms and formats.
 * [Work Breakdown Structure Plugin](https://gitlab.tugraz.at/dbp/plan/plan-plugin-WBSplan) - Browse your tasks as a WBS
+* [Milestone Plugin](https://github.com/oliviermaridat/kanboard-milestone-plugin) - Shows related tasks for milestones and their progress