Create LOCK_CONTACT.md

Author: perry-mitchell

LOCK_CONTACT.md

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+# WebDAV Client Lock
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+If you've reached this page by following a URL attached to a WebDAV resource lock, then the client imposing the lock has not specified a custom/personalised lock contact URL. This means that there is unfortunately no way to contact the owning user by simply inspecting the lock.
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+If you've reached this page by exploring the WebDAV client library repository, this page is the default `LOCK` method contact URL. You can override it when creating a new WebDAV client instance.