Add license rules from libzmq

Reference: #3544

Signed-off-by: Ayan Sinha Mahapatra <ayansmahapatra@gmail.com>

Author: AyanSinhaMahapatra

src/licensedcode/data/rules/mpl-2.0_141.RULE

@@ -0,0 +1,8 @@
+---
+license_expression: mpl-2.0
+is_license_reference: yes
+ignorable_urls:
+    - https://raw.github.com/zeromq/libzmq/master/LICENSE
+---
+
+license {{https://raw.github.com/zeromq/libzmq/master/LICENSE}}

src/licensedcode/data/rules/mpl-2.0_142.RULE

@@ -0,0 +1,7 @@
+---
+license_expression: mpl-2.0
+is_license_reference: yes
+is_continuous: yes
+---
+
+{{zeromq/libzmq LICENSE}}

src/licensedcode/data/rules/mpl-2.0_143.RULE

@@ -0,0 +1,12 @@
+---
+license_expression: mpl-2.0
+is_license_notice: yes
+referenced_filenames:
+    - LICENSE
+---
+
+LICENSE
+-------
+Free use of this software is granted under the terms of the Mozilla Public
+License Version 2.0 (MPL-2.0). For details see the file `LICENSE` included with
+the 0MQ distribution.