feat: Add basic key-value store example

- Added a client and server for a simple key-value store.
- Improved documentation with client and server usage examples.
- Created client and server implementations using the V language.

examples/data/ourdb_server.vsh

@@ -4,7 +4,7 @@ import freeflowuniverse.herolib.data.ourdb
 import os
 
 mut server := ourdb.new_server(
-	port:               9000
+	port:               3000
 	allowed_hosts:      ['localhost']
 	allowed_operations: ['set', 'get', 'delete']
 	secret_key:         'secret'