added new file

Signed-off-by: Nick Chappell <nick@intronic.org>

Merged in from Github PR29: https://github.com/Icinga/puppet-icinga2/pull/29

refs#7213: https://dev.icinga.org/issues/7213
* fixed #7213

Signed-off-by: Nick Chappell <nick@intronic.org>

Merged in from Github PR29: https://github.com/Icinga/puppet-icinga2/pull/29

refs#7213: https://dev.icinga.org/issues/7213
Small README fixes.
Changelog update for the CheckCommand object added from PR29: https://github.com/Icinga/puppet-icinga2/pull/29

refs#7213: https://dev.icinga.org/issues/7213
Update the path for the target directory so it matches the target directories of the other object types.
Added the CheckCommand object to the object list and linked to it's subsection.
Add the id: anchor link to the apply_service_to_host object's subsection header.