Defined the folders structure for unit-tests

~dev_rating/application/tests/readme.md

@@ -4,4 +4,12 @@ Instruction:
 2. (From app/system dir) Tools -> Add dependency -> phpunit/phpunit -> install
 3. Settings -> Composer -> Path to bootstrap: /grade-rating/~dev_rating/system/composer.json
 4. Go to any test from /app/tests folder
-5. Right mouse click -> Run
+5. Right mouse click -> Run
\ No newline at end of file
+
+
+Notes:
+
+1. All tests are stored in the `application/tests` folder.
+2. Tree structure should be saved (like in `application/classes`).
+3. Append `Test` to all scripts, i.e. `tests/classes/Model/DisciplineTest.php` 
+   containing `Model_Discipline_Test` class.
\ No newline at end of file