Prepare first release

[Eduardo N.S.R.]

For the first release be placed, we need to resolve the issues #7, #17, #18 and #19. After completion of these issues, we can continue generating a first version of the library.

After these, we will create a v0.1 release tag. For this, we will present the following structures:

• Singly-linked List;
• Doubly-linked List;
• Doubly-circular List;
• Singly-list-backed Queue;
• Singly-list-backed Stack;
• Doubly-list-backed Deque;
• Deque-backed Queue;
• Deque-backed Stack;
• Iterators to iterate through the structures;