Add README.md for ex05

courses/ruby/ex05_readme/README.md

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+# string-method_missing
+
+In this exercise you should implement next methods:
+
+- var.ask
+- var.names_compare?
+- var.parent
+
+where 'var' is your variable name and 'names_compare' is expected string from tests.
+
+## .ask
+
+This spec should return instance of StringAsk class
+
+Example: var = 'some_string'.ask # => 'some_string'
+
+## .names_compare?
+
+This spec should compare the string with self value of instance of StringAsk class.
+
+Example: var.some_string?        # => true
+         var.other_string?       # => false
+Thus, you need to implement method for string which will return true if string is the same as the method name.
+
+## .parent
+
+This spec should return the parent class your class was inheritated from.
+
+Example: var.parent            # => String
+
+## Resources
+
+[Method Missing in Ruby](https://medium.com/podiihq/method-missing-in-ruby-af4c6edd5130)