Create CONTRIBUTING.md

CONTRIBUTING.md

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+## Welcome to our repository, contributor!
+### If you want to contribute, please read text below. Thank you.
+***
+
+
+## Variables
+* All global variables must be named using upper case, just like: `EXAMPLE_VARIABLE, VERY_IMPORTANT_VARIABLE, ANOTHER_ONE` 
+
+* All local variables must be named using lower case, just like: `example_variable, very_important_variable, another_one`
+
+* All variables must have good readable names.
+
+Variables | Example
+-- | --
+Good | `employees_count, user_month_work_days_count, YEAR_TAX, MAX_COMPUTED_SALARY`
+Bad | `x, $fb, f_ar_type_data, f_obj_result, inputData, returnValue, resultArray, obj1, obj2`
+
+## Functions
+* Every function must be named like this: `exampleFunction, veryImportantFunction, justAnotherExample`
+
+* All functions must have good readable names.
+
+Functions | Example
+-- | --
+Good | `getFullName(), createUser(), startSession(), removeLayer()`
+Bad | `getFullNameAndUserID(), calculateVariable(), abcdeFG(), redBug()`
+
+## Classes
+* Every class must be named like this: `ExampleClass, VeryImportantClass, JustAnotherClass`
+* All classes must have good readable names.
+
+Classes | Example
+-- | --
+Good | `UserMapper, SystemLoader, PlayerBase, Logger, Scheduler`
+Bad | `ABCDEFG, ClassForAllProject, JustMathClass, AllInOneClass`