add contributors

Author: prohde

CONTRIBUTORS.md

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+# Contributors
+A list of all the people who contributed to the project.
+
+## Core Team
+- Philipp D. Rohde [ORCID:0000-0002-9835-4354](https://orcid.org/0000-0002-9835-4354)
+
+## Student Assistants (alphabetical by surname)
+- Avellino
+  - Aggregates 
+  - BIND clause
+  - Complex expressions
+  - Datatypes
+  - GROUP BY clause
+  - HAVING clause
+- Mazen Bechara [ORCID:0009-0009-7554-3935](https://orcid.org/0009-0009-7554-3935)
+  - VALUES clause
+- Gabriela Ydler
+  - Logo