Add ndx-binned-spikes extension (#55)

Co-authored-by: Ryan Ly <rly@lbl.gov>

Author: h-mayorquin

ndx-binned-spikes/README.md

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+# ndx-binned-spikes Extension for NWB
+
+This extension is meant for storing binned spike count data from neural recordings. It provides two types: `BinnedAlignedSpikes` for storing spike counts aligned to specific events (like stimuli or behavioral events) in a 3D structure (units × events × bins), ideal for peri-stimulus time histogram (PSTH) analysis; and `BinnedSpikes` for storing continuous spike counts across entire experimental sessions in a 2D structure (units × bins), useful for analyzing long-term neural activity patterns. Both classes support linking to NWB Units tables and can handle multiple units simultaneously, making it easy to store and analyze pre-binned spike data without recomputing from raw spike times.
+
+See the full description and documentation at:
+https://github.com/catalystneuro/ndx-binned-spikes
+

ndx-binned-spikes/ndx-meta.yaml

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+name: ndx-binned-spikes
+version: 0.3.1
+src: https://github.com/catalystneuro/ndx-binned-spikes
+pip: https://pypi.org/project/ndx-binned-spikes/
+license: BSD
+maintainers:
+  - h-mayorquin
+
+