Ignore .abpstudio and add solution id

Update .gitignore to exclude **/.abpstudio/** (and normalize newline for an existing entry). Add an "id" field to framework/Volo.Abp.abpsln (9f9e3d5f-6a9a-4b00-ac5a-746c65981918) to record the solution identifier.

.gitignore

@@ -329,4 +329,5 @@ deploy/_run_all_log.txt
 # No commit yarn.lock files in the subfolders of templates directory
 templates/**/yarn.lock
 templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc/Logs/logs.txt
-templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Web/Properties/launchSettings.json
+templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Web/Properties/launchSettings.json
+**/.abpstudio/**

framework/Volo.Abp.abpsln

@@ -4,5 +4,6 @@
     "Volo.Abp": {
       "path": "Volo.Abp.abpmdl"
     }
-  }
+  },
+  "id": "9f9e3d5f-6a9a-4b00-ac5a-746c65981918"
 }