Missing text in LICENSE file (no change to license terms)

The last two lines of the BSD license omitted by accident are put back.

All the license text is removed from the README in favor of the LICENSE file.

Co-authored-by: Laurence Lundblade <lgl@securitytheory.com>
diff --git a/ub-example.c b/ub-example.c
index 996cf3a..ec776dc 100644
--- a/ub-example.c
+++ b/ub-example.c
@@ -5,7 +5,7 @@
 
    SPDX-License-Identifier: BSD-3-Clause
 
-   See BSD-3-Clause license in README.md
+   See BSD-3-Clause license in file named "LICENSE"
 
    Created on 4/8/22
   ========================================================================== */