📝 Add explanation for CLI check command

README.md

@@ -147,6 +147,28 @@ work:
 > defining two functions `find_squirrel` and `list_squirrels` you can then
 > import and use in your code.
 
+### CLI Commands
+
+Squirrel offers the following commands to streamline your workflow:
+
+- `gleam run -m squirrel`: Generates type-safe Gleam code for all SQL queries found in `src/**/sql/*.sql`.
+- `gleam run -m squirrel check`: Validates that the generated Gleam code is up-to-date with the SQL queries.
+
+#### `check` Command
+The `check` command ensures consistency between your `.sql` files and the generated code. It is particularly useful for Continuous Integration (CI) pipelines or when validating changes in your project. 
+
+If discrepancies are found, Squirrel will report the files that need to be updated. You can regenerate the code using the default command:
+
+```bash
+gleam run -m squirrel
+```
+
+#### Example usage:
+
+```bash
+gleam run -m squirrel check
+```
+
 ### Talking to the database
 
 In order to understand the type of your queries, Squirrel needs to connect to