Added first test of example

examples/ustack_in_using.md

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+# Getting started
+To start, install ufpy lib by command
+### Windows
+pip install ufpy
+### Linux
+
+
+## Examples
+To create stack, use UStack class.
+stack = UStack()
+To add an element to the stack, use UStack.append([<element1>, <elementN, ...])
+stack.append(1, 2, 3, 4, 5)
+To get the top element, use UStack.top()
+print(stack.top())
+# 5
+To get and remove the top element of the stack, use UStack.pop()
+print(stack.pop())
+# 5
+print(stack.top())
+# 4
+## All methods
+| Name    | Args    |
+| ------- | ------- |
+| top     | null    |
+| append  | **items |
+| pop     | null    |