Add Changelog with latest changes.

CHANGELOG.md

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+### [Unreleased]
+- Improvement: Allow default view for teachers to be set at admin level.
+
+### Date:		2017-May-23
+### Release:	2017052301
+
+- New Feature: New site Level/course category report with average course attendance.
+- New Feature: Allow unmarked students to be automatically marked when session closes.
+
+---
+
+### Date:		2017-May-11
+### Release:	2017051104
+
+- New Feature: Allow subnet mask to be set at the attendance session level.
+- New Feature: Allow certain statuses to be hidden from students when self-marking attendance.
+- New Feature: Allow student password to be viewed on session list page.
+- Improvement: Improve usablity by grouping settings on session add form.
+- Bug fix - fix issue with displaying dates when site hosted on Windows server.
+- Bug fix - improve compliance with Moodle coding guidelines.
+
+---
+
+### Date:		2017-Apr-21
+### Release:	2017042100
+
+- Feature: Allow a random self-marking password to be used when creating session.
+- Improvement: #63 use core useridentity setting when showing list of users.
+- Improvement: #258 Add link to attendance on student overview report.
+- Improvement: allow student self-marking to be restricted to the session time.
+- Improvement: allow admin to set default values when teachers creating new sessions.
+- Bug fix - improve compliance with Moodle coding guidelines - phpdocs etc.
+
+---
+