docs: add Arbor (#1016)

* Add Arbor

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update docs/data/projects.yml

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>

docs/data/projects.yml

@@ -510,3 +510,15 @@
   notes: A modern implementation of a PostgreSQL adapter for Python
   ci: [github]
   os: [windows, apple, linux]
+
+- name: Arbor
+  gh: arbor-sim/arbor
+  ci: [github]
+  os: [apple, linux]
+  pypi: arbor
+  notes: >
+    Arbor is a multi-compartment neuron simulation library; compatible with
+    next-generation accelerators; best-practices applied to research software;
+    focused on community-driven development. Includes a
+    [small script](https://github.com/arbor-sim/arbor/blob/master/scripts/patchwheel.py)
+    patching `rpath` in bundled libraries.