Add launchSettings.json to TodosApi (#1834)

Also remove launchSettings.json from the .gitignore. It was removed from the base gitignore repo in c26008c00d.

.gitignore

@@ -54,7 +54,6 @@ dlldata.c
 project.lock.json
 project.fragment.lock.json
 artifacts/
-**/Properties/launchSettings.json
 
 *_i.c
 *_p.c

src/BenchmarksApps/TodosApi/Properties/launchSettings.json

@@ -0,0 +1,15 @@
+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "api/todos",
+      "applicationUrl": "http://localhost:5054",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}