docs: Add Todo README

Author: NikiforovAll

samples/Todo/README.md

@@ -1,6 +1,23 @@
 # Todo app using Nall.Aspire.Hosting.DependsOn
 
-## Migrations
+Startup dependencies:
+
+```mermaid
+graph TD;
+    db-server --> pgAdmin;
+    db-server --> db;
+    db --> migrator;
+    db --> api;
+    migrator --> api;
+```
+
+## Run
+
+```bash
+dotnet run --project AppHost
+```
+
+### Migrations
 
 ```bash
 dotnet ef migrations add "Initial_Migration" \