Add missing information about chkwer in readme (#251)

* Add missing information about `chkwer` in readme

* update readme

README.md

@@ -87,6 +87,8 @@ program to use, what tests to check and how many CPUs to use. Run `sinol-make in
 - `sinol-make verify` -- Verifies the package. This command runs stress tests (if available), verifies the config,
 generates tests, generates problem statements, runs inwer and run all solutions. Ingen and inwer are compiled with
 address and UB sanitizers. Run `sinol-make verify --help` to see all available flags.
+- `sinol-make chkwer` -- Run checker with model solution and print results. Prints a table with points and checker's comments.
+This command fails if the model solution didn't score maximum points. Run `sinol-make chkwer --help` to see all available flags.
 - `sinol-make init [id]` -- Creates package from template [on github](https://github.com/sio2project/sinol-make/tree/main/example_package) and sets task id to provided `[id]`. Requires an internet connection to run.
 
 You can also run multiple commands at once, for example:
@@ -102,6 +104,7 @@ There are also available short aliases for the commands:
 - `sinol-make e` for `sinol-make export`
 - `sinol-make d` for `sinol-make doc`
 - `sinol-make v` for `sinol-make verify`
+- `sinol-make c` for `sinol-make chkwer`
 - `sm` for `sinol-make`
 
 ### Contest types