Improving sprints

Moved from: https://github.com/dwyl/hq/issues/42

This is part of dwyl _process_ and a `readme` will be created with all of these.
- **Testing**
- Merge _often_, single pieces of functionality per PR rather than a whole sprint
- Use of issues for task tracking:
- Create a user story for each feature
- Stories have to be _agreed with client_
- Assign priorities
- Before you start working on an issue, you must _assign it to yourself_
- Every issue should have a milestone
- Commit messages **should always have an issue # in them**; if it doesn't, then that should be a red flag :triangular_flag_on_post: that something is wrong
- Every user story issue should have a time estimate against it
- Daily standups are the most important meeting of your day - they need to both start and finish on time
- Mentor time needs to be scheduled in where possible, it's unfeasible for mentors to be available 'as needed'