(doc) Add changelog and contributing guidlines

This commit adds a changelog and contributing guidelines to vmpooler. Without this change vmpooler offers no specific contributing guidelines or changelog.

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+
+The format is based on
+[Keep a Changelog](http://keepachangelog.com)
+& makes a strong effort to adhere to
+[Semantic Versioning](http://semver.org).
+
+Tracking in this Changelog began for this project with the tagging of version 0.1.0.
+If you're looking for changes from before this, refer to the project's
+git logs & PR history.
+
+# [Unreleased](https://github.com/puppetlabs/vmpooler/compare/4c858d012a262093383e57ea6db790521886d8d4...master)
+
+### Fixed
+
+- Remove unused method `find_pool` and related pending tests
+- Setting `max_tries` results in an infinite loop (POOLER-124)
+- Do not evaluate folders as VMs in `get_pool_vms` (POOLER-40)
+- Expire redis VM key when clone fails (POOLER-31)
+- Remove all usage of propertyCollector
+- Replace `find_vm` search mechanism (POOLER-68)
+- Fix configuration file loading (POOLER-103)
+- Update vulnerable dependencies (POOLER-101)
+
+### Added
+
+- Allow API and manager to run separately (POOLER-109)
+- Add configuration API endpoint (POOLER-107)
+- Add option to disable VM hostname mismatch checks
+- Add a gemspec file
+- Add time remaining information (POOLER-81)
+- Ship metrics for clone to ready time (POOLER-34)
+- Reduce duplicate checking of VMs
+- Reduce object lookups when retrieving VMs and folders
+- Optionally create delta disks for pool templates
+- Drop support for any ruby before 2.3
+- Add support for multiple LDAP search base DNs (POOLER-113)
+- Ensure a VM is only destroyed once (POOLER-112)
+- Add support for setting redis server port and password
+- Greatly reduce time it takes to add disks
+- Add Dockerfile that does not bundle redis
+- Add vmpooler.service to support systemd managing the service