docs: update README to include environment management commands

- Added documentation for new commands related to environment management: `dokploy environment:create` and `dokploy environment:delete`.
- Enhanced clarity on usage instructions for managing environments within the project.

Author: Siumauricio

readme.md

@@ -57,6 +57,11 @@ USAGE
 - `dokploy project:info`: Get information about an existing project.
 - `dokploy project:list`: List all projects.
 
+### Environment Management
+
+- `dokploy environment:create`: Create a new environment.
+- `dokploy environment:delete`: Delete an existing environment.
+
 ### Application Management
 
 - `dokploy app:create`: Create a new application.