Create README.md

__tests__/README.md

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+# How to add tests
+
+* Update `./src/.stylelintrc.json` with your new rules
+* Run npm run build to generate `./index.js`
+* Create your test file named after the scss-lint your you are adding a stylelint rule for
+* Copy the code from one of the other tests into your test new file
+* Update the test so you have .scss code that will produce lint you want to test for
+* Add a console.log statement within the checkResult function in the test file passing `result` to the log statement. e.g. `console.log(result)`
+* Look for warnings it generates
+* Copy expected text to test file
+* Escape quotes in your expected error text
+* Run tests again and refine until they pass
+* Update `t.plan(2)` to the number of tests you have