Added the preliminary license (not finalized!)

Signed-off-by: David Mulder <dmulder@samba.org>

diff --git a/preliminary_license.md b/preliminary_license.md
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+**[Note: This is the notice that would go on the final version of the specification.]**
+
+# UNIX Extensions for SMB2 Specification License, Version 1.0
+
+This specification for Unix Extensions for SMB2, Version 1.0 (the “Specification”)
+contains contributions from the following Contributors: [List of all contributors].
+
+Each Contributor grants the following rights and makes the following promises with
+respect to the Specification, subject to the indicated limitations and other provisions:
+
+* Each Contributor grants you the right under its copyrights to reproduce and
+distribute copies of those Contributions as a part of the Specification. You are
+not authorized to create any derivative works of the Specification.
+* Each Contributor agrees not to assert any of its patent claims that are
+necessarily infringed by an implementation of the Specification on account of
+your making, using, selling, offering for sale, or importing an implementation of all
+required portions of the Specification.
+* Each Contributor reserves all of its rights not expressly granted above. No
+additional rights other than those described above are granted by implication,
+exhaustion, estoppel or otherwise.
+* The licenses and promises made above do not extend to any technologies that
+may be referenced by the Specification or that may be required in order to
+implement the Specification.
+* The Contributors do not give any assurance that any of its intellectual property
+rights cover your implementation or are enforceable.
+* Each Contributor may revoke its license and/or promise granted above if you or
+anyone affiliated with you allege that the Contributor’s implementation of any
+portion of the Specification infringes any of your or your affiliates’ patent rights.
+* THE CONTRIBUTIONS AND SPECIFICATION ARE PROVIDED “AS IS” AND
+THE CONTRIBUTORS DISCLAIM ALL WARRANTIES, GUARANTEES, AND
+CONDITIONS, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING
+BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OR MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
+* TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE
+CONTRIBUTORS DISCLAIM LIABILITY FOR ANY INDIRECT, INCIDENTAL,
+CONSEQUENTIAL, PUNITIVE OR SPECIAL DAMAGES WHATSOEVER
+ARISING OUT OF OR IN ANY WAY CONNECTED TO THE USE OF OR
+INABILITY TO USE THE CONTRIBUTIONS OR SPECIFICATION, OR
+OTHERWISE UNDER OR IN CONNECTION WITH ANY PROVISION OF THIS
+NOTICE, REGARDLESS OF THE LEGAL THEORY UPON WHICH ANY CLAIM
+FOR SUCH DAMAGES IS BASED. THE FOREGOING EXCLUSION APPLIES
+EVEN IF A CONTRIBUTOR HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES IN ADVANCE AND EVEN IF ANY AVAILABLE REMEDY
+FAILS OF ITS ESSENTIAL PURPOSE.
+* This notice does not grant any right to use any of the names and trademarks of
+any of the Contributors for any purpose.
+
+Additional Contributor-specific notices:
+
+* Microsoft has made available a license for its patents covering the SMB2
+protocol. The terms of that license can be accessed by contacting
+protocol@microsoft.com.