Add license rules for Simplified BSD with LICENSE.txt reference (#5299)

Author: tirthraj01

src/licensedcode/data/rules/bsd-simplified_344.RULE

@@ -0,0 +1,9 @@
+---
+license_expression: bsd-simplified
+is_license_reference: yes
+relevance: 100
+referenced_filenames:
+    - LICENSE.txt
+---
+
+Distributed under the Simplified BSD License LICENSE.txt

src/licensedcode/data/rules/bsd-simplified_345.RULE

@@ -0,0 +1,9 @@
+---
+license_expression: bsd-simplified
+is_license_reference: yes
+relevance: 100
+referenced_filenames:
+    - LICENSE.txt
+---
+
+Simplified BSD License LICENSE.txt