Add nest-cli.json configuration file

This adds a new configuration file for the Nest CLI to the project. The file specifies the schema, schematics collection, source root directory, and compiler options, including deleting the output directory before building.

nest-cli.json

@@ -0,0 +1,8 @@
+{
+  "$schema": "https://json.schemastore.org/nest-cli",
+  "collection": "@nestjs/schematics",
+  "sourceRoot": "src",
+  "compilerOptions": {
+    "deleteOutDir": true
+  }
+}