Added CONTRIBUTIONS.md to source

CONTRIBUTIONS.md

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+# Contributions to the Apprise API project
+
+## Creator & Maintainer
+
+* Chris Caron <[email protected]>
+
+## Contributors
+
+The following users have contributed to this project and their deserved
+recognition has been identified here.  If you have contributed and wish
+to be acknowledged for it, the syntax is as follows:
+
+```
+* [Your name or handle] <[email or website]>
+  * [Month Year] - [Brief summary of your contribution]
+```
+
+The contributors have been listed in chronological order:
+* Scott Elblein <https://github.com/STaRDoGG>
+  * 23rd Sep 2023 - Provided Dark Theme