Add the JSON language to the import and exporter section

src/doc/docs/platform_essentials/mpsutils/importer_and_exporter.md

@@ -23,3 +23,32 @@ This plugin adds two actions for importing XML files into MPS:
 - *Import XML File(s)*: This action parses on or multiple XML files and creates XML root nodes for them in the
   selected model.
 
+## JSON
+
+> ^^com.mbeddr.mpsutil.json^^
+
+This language implements a simple JSON language you can use as a generator target. The [JSON file](http://127.0.0.1:63320/node?ref=r%3Abe665d13-1e1d-44cd-9817-8bd4d610f422%28com.mbeddr.mpsutil.json.structure%29%2F4342692121161094115) root node supports an additional package name used as the folder inside the generation folder.
+
+An example of a file that you can generate:
+
+```json
+{ 
+  "description" : "This is a JSON file", 
+  "name" : "my JSON file", 
+  "this is an object" : { 
+    "And another object" : { 
+      "With a description" : "object description", 
+      "An array" : [ 
+        "valu1", 
+        "value2" 
+      ], 
+      "withANumber" : 1.232E+231231, 
+      "empty array" : [ ], 
+      "empty object" : { }, 
+      "empty string" : "" 
+    } 
+  } 
+}
+```
+
+An importer also exists for the language. It can import all JSON files in a folder or just single files.

src/doc/mkdocs.yml

@@ -388,7 +388,6 @@ nav:
           - Base Language Extensions: platform_essentials/mpsutils/baselanguage_extensions.md
           - Generator: platform_essentials/mpsutils/generator.md
           - Importer and Exporter: platform_essentials/mpsutils/importer_and_exporter.md
-          - Languages: platform_essentials/mpsutils/languages.md
           - Language Extensions: platform_essentials/mpsutils/language_extensions.md
           - Tools: platform_essentials/mpsutils/tools.md
           - UI: platform_essentials/mpsutils/ui.md