Add JSON schema for external plugin - "mkdocs-awesome-nav".

docs/schema/plugins/external/awesome-nav.json

@@ -0,0 +1,29 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "title": "Custom advanced navigation config for MkDocs using extra YAML files.",
+  "oneOf": [
+    {
+      "markdownDescription": "https://github.com/lukasgeiter/mkdocs-awesome-nav",
+      "const": "awesome-nav"
+    },
+    {
+      "type": "object",
+      "properties": {
+        "awesome-nav": {
+          "type": "object",
+          "markdownDescription": "https://lukasgeiter.github.io/mkdocs-awesome-nav",
+          "properties": {
+            "filename": {
+              "title": "The YAML file that defines the navigation",
+              "markdownDescription": "https://lukasgeiter.github.io/mkdocs-awesome-nav",
+              "type": "string",
+              "default": ".nav.yml"
+            }
+          },
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    }
+  ]
+}