Create CITATION.md

Author: chrisdburr

CITATION.md

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+@software{alan-turing-institute/turing-commons,
+  author = {
+    Burr, Christopher and
+    Barlow, Nick and
+    Borda, Ann and
+    Ding, Jennifer and
+    Dominguez, Andres and
+    Fischer, Claudia and
+    Hadjiloizou, Semeli and
+    Hashem, Youmna and
+    Jaydeva, Smera and
+    Katell, Michael and
+    Leslie, David and
+    Powell, Rosamund and
+    Rincon, Cami and
+    Sharan, Malvika
+  },
+  title = {Turing Commons},
+  year = {2025},
+  url = {https://github.com/alan-turing-institute/turing-commons},
+  doi = {},
+  note = {Accessed on [Date]}
+}