Added CONTRIBUTORS.txt

CONTRIBUTORS.txt

@@ -0,0 +1,11 @@
+Contributor offers to license certain software (a “Contribution” or multiple
+“Contributions”) to Pytest Celery, and Pytest Celery agrees to accept said Contributions,
+under the terms of the BSD open source license.
+Contributor understands and agrees that Pytest Celery shall have the irrevocable and perpetual right to make
+and distribute copies of any Contribution, as well as to create and distribute collective works and
+derivative works of any Contribution, under the BSD License.
+
+Contributors
+------------
+
+Tomer Nosrati, 2022/17/07