feat: initial datamodel + ef connection and migrations

Initial version of the data model
Includes EF initialization and migrations
EF migrations are applied on application start

TournamentOrganizer.Browser/Properties/AssemblyInfo.cs

@@ -0,0 +1 @@
+[assembly:System.Runtime.Versioning.SupportedOSPlatform("browser")]

TournamentOrganizer.Browser/Properties/launchSettings.json

@@ -0,0 +1,13 @@
+{
+    "profiles": {
+    "TournamentOrganizer.Browser": {
+        "commandName": "Project",
+        "launchBrowser": true,
+        "environmentVariables": {
+          "ASPNETCORE_ENVIRONMENT": "Development"
+        },
+        "applicationUrl": "https://localhost:7169;http://localhost:5235",
+        "inspectUri": "{wsProtocol}://{url.hostname}:{url.port}/_framework/debug/ws-proxy?browser={browserInspectUri}"
+      }
+    }
+}