docs: added integrations

docs/integrations.md

@@ -0,0 +1,20 @@
+## AngularJS
+
+ShowdownJS project provides seamless integration with AngularJS via a plugin.
+
+Check [`ng-showdown`](https://github.com/showdownjs/ngShowdown) repository for more information.
+
+## TypeScript
+
+If you're using TypeScript, you may want to use the types from the [DefinitelyTyped][definitely-typed] repository.
+
+## SystemJS/JSPM
+
+To integrate ShowdownJS with SystemJS, you can use a third-party [system-md plugin](https://github.com/guybedford/system-md).
+
+## Vue.js
+
+To use ShowdownJS as a Vue component, you can check [vue-showdown](https://vue-showdown.js.org/).
+
+
+[definitely-typed]: https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/showdown

mkdocs.yml

@@ -37,4 +37,5 @@ nav:
     - Showdown options: configuration.md
     - Available options: available-options.md
     - Flavors: flavors.md
-  - CLI: cli.md
+  - CLI: cli.md
+  - Integrations: integrations.md