Update CONTRIBUTING.md

Author: vors

CONTRIBUTING.md

@@ -6,21 +6,6 @@ There are two permanent brances: **master** and **dev**.
 All development is done in **dev** branch, 
 please, use it for pull requests.
 
-
-Run tests locally
------------------
-The most up-to date version can be crafted by following [appveyor tests steps](appveyor.yml).
-Currently tests use hardcoded path for a sublime text installation `C:\st`. 
-You can use the same script [appveyour.ps1](https://github.com/randy3k/UnitTesting/blob/master/sbin/appveyor.ps1) for installing sublime and tests execution.
-Separate installation used to avoid accident breaking the main installtion.
-
-One time install:
-
-1. download [appveyour.ps1](https://github.com/randy3k/UnitTesting/blob/master/sbin/appveyor.ps1).
-2. run one-time bootstrap: `.\appveyor.ps1 "bootstrap" -verbose` to install ST in `C:\st` and download [UnitTesting](https://github.com/randy3k/UnitTesting) package.
-3. Install PowerShell unit testing framework [Pester](https://github.com/pester/Pester).
-
-Run tests:
-
-1. Run python tests `.\appveyor.ps1 "run_tests" -verbose`. They generate inputs for pester tests.
-2. Run pester tests `Invoke-Pester`.
+If you are fixing grammar (syntax highlighting), please, add affected samples to [test-file.ps1](/tests/samples/test-file.ps1). 
+We use it in automated tests that compare grammar against PowerShell tokenizer.
+It also serves as a place for humans to stair into all exotic language constructions.