rename LICENSE.md to LICENSE.txt

Author: kathyxchen

LICENSE.md LICENSE.txtLICENSE.md renamed to LICENSE.txt

@@ -1,7 +1,9 @@
 Copyright (c) [2021] [The Trustees of Princeton University, The Simons Foundation, Inc. and The University of Texas Southwestern Medical Center]
 All rights reserved.
+
 Redistribution and use in source and binary forms, with or without
 modification, are permitted for academic and research use only (subject to the limitations in the disclaimer below) provided that the following conditions are met:
+
      * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
      * Redistributions in binary form must reproduce the above copyright
@@ -10,6 +12,7 @@ modification, are permitted for academic and research use only (subject to the l
      * Neither the name of the copyright holders nor the names of its
      contributors may be used to endorse or promote products derived from this
      software without specific prior written permission.
+     
 NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY
 THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT