Create TEAM.md (zarr-developers#1628)

Author: jhamman

TEAM.md

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+## Active core-developers
+- @joshmoore (Josh Moore)
+- @jni (Juan Nunez-Iglesias)
+- @rabernat (Ryan Abernathey)
+- @jhamman (Joe Hamman)
+- @d-v-b (Davis Bennett)
+- @jakirkham (jakirkham)
+- @martindurant (Martin Durant)
+
+## Emeritus core-developers
+- @alimanfoo (Alistair Miles)
+- @shoyer (Stephan Hoyer)
+- @ryan-williams (Ryan Williams)
+- @jrbourbeau (James Bourbeau)
+- @mzjp2 (Zain Patel)
+- @grlee77 (Gregory Lee)
+
+## Former core-developers
+- @jeromekelleher (Jerome Kelleher)
+- @tjcrone (Tim Crone)
+- @funkey (Jan Funke)
+- @shikharsg
+- @Carreau (Matthias Bussonnier)
+- @dazzag24
+- @WardF (Ward Fisher)