Add documentation about Kanban

docs/kanban-vs-todo-and-scrum.markdown

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+Kanban vs Todo lists and Scrum
+==============================
+
+Kanban vs Todo lists
+--------------------
+
+### Todo lists:
+
+- Single phase (just a list of items)
+- Multitasking possible (not efficient)
+
+### Kanban:
+
+- Multiple phases, each column represent a step
+- Bring focus and avoid multitasking because you can set a work in progress limit per column
+
+Kanban vs Scrum
+---------------
+
+### Scrum:
+
+- Sprints are time-boxed, usually 2 or 4 weeks
+- Do not allow changes during the iteration
+- Estimation is required
+- Uses velocity as default metric
+- Scrum board is cleared between each sprint
+- Scrum has predefined roles like scrum master, product owner and the team
+- A lot of meetings: planning, backlog grooming, daily stand-up, retrospective
+
+### Kanban:
+
+- Continuous flow
+- Changes can be made at anytime
+- Estimation is optional
+- Use lead and cycle time to measure performance
+- Kanban board is persistent
+- Kanban doesn't impose strict constraints or meetings, process is more flexible