docs: add docs on meta-plugin

packages/dm-core-plugins/docs/MetaPlugin/Documentation.md

@@ -0,0 +1,14 @@
+Plugin for displaying the `_meta_`-attribute of any entity. The entity it self will be displayed right under the meta-information.
+
+![MetaPlugin](./meta.png)
+
+## Usage
+
+```json
+{
+    "type": "CORE:UiRecipe",
+    "name": "Meta",
+    "plugin": "@development-framework/dm-core-plugins/meta"
+}
+```
+The plugin can be used on any type of entity, and has no configuration.

packages/dm-core-plugins/docs/MetaPlugin/Examples/Basic.json

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+{
+  "title": "Example",
+  "description": "Minimal example of meta plugin",
+  "note": "",
+  "showDemo": true,
+  "blueprint": {
+    "type": "CORE:Blueprint",
+    "name": "Example",
+    "description": "",
+    "attributes": [
+      {
+        "type": "dmss://system/SIMOS/BlueprintAttribute",
+        "name": "type",
+        "attributeType": "string",
+        "optional": false
+      }
+    ]
+  },
+  "entity": {
+    "type": "./Example",
+    "_id": "1179c897-df62-445f-87e4-f393b4253936"
+  },
+  "recipe": {
+    "type": "CORE:UiRecipe",
+    "name": "Meta",
+    "plugin": "@development-framework/dm-core-plugins/meta"
+  }
+}