Add initial appsettings.json configuration for logging and Elsa server setup

- Introduced logging configuration with default, system, and Microsoft log levels.
- Added Elsa server URL and hosting base path settings.

src/apps/Elsa.Studio.Web/appsettings.json

@@ -0,0 +1,15 @@
+{
+    "Logging": {
+        "LogLevel": {
+            "Default": "Debug",
+            "System": "Information",
+            "Microsoft": "Information"
+        }
+    },
+  "ElsaServer": {
+    "Url": "https://localhost:5001/elsa/api"
+  },
+  "Hosting": {
+    "BasePath": ""
+  }
+}