add steps order in readme

README.md

@@ -109,24 +109,18 @@ make REPO=yegor256/tojos
 
 ## How to Contribute (e.g. by adding a new metric)
 
-If you want to add a new metric to the script, fork a repository and
-create a new file in the `metrics/` directory, using one of
-the existing files as an example.
-Then, create a test for your metric, in the `tests/metrics/` directory.
+For example, you want to add a new metric to the script:
 
-Then, run the entire test suite
-(this should take a few minutes to complete, without errors):
+1. Fork a repository.
+2. Create a new file in the `metrics/` directory, using one of the existing files as an example.
+3. Create a test for your metric, in the `tests/metrics/` directory.
+4. Run the entire test suite (this should take a few minutes to complete, without errors):
 
 ```bash
 sudo make install
-make test lint
+sudo make test lint
 ```
 
-Then, send us a
-[pull request](https://www.yegor256.com/2014/04/15/github-guidelines.html).
-We will review your changes and apply them to the `master` branch shortly,
-provided they don't violate our quality standards.
-
 You can also test it with Docker:
 
 ```bash
@@ -141,6 +135,10 @@ if you don't change any installation scripts:
 docker run -v $(pwd):/c --rm yegor256/cam:0.9.2 make -C /c test
 ```
 
+5. Send us a [pull request](https://www.yegor256.com/2014/04/15/github-guidelines.html). 
+We will review your changes and apply them to the `master` branch shortly,
+provided they don't violate our quality standards.
+
 ## How to Calculate Additional Metrics
 
 You may want to use this dataset as a basis, with an intend of adding your own