Created new extension for ndx-hed (#48)

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

ndx-hed/README.md

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+# ndx-hed Extension for NWB
+
+[**Neurodata Without Borders (NWB)**](https://www.nwb.org/) is a data standard for organizing neurophysiology data.
+NWB is used extensively as the data representation for single cell and animal recordings as well as
+human neuroimaging modalities such as IEEG. HED (Hierarchical Event Descriptors) is a system of
+standardized vocabularies and supporting tools that allows fine-grained annotation of data.
+HED annotations can now be used in NWB to provide a column of HED annotations for any NWB
+dynamic table. 
+
+The [**HED annotation in NWB**](https://www.hed-resources.org/en/latest/HedAnnotationInNWB.html)
+user guide explains in more detail how to use this extension for HED.
+
+
+## Installation
+
+**Python:**
+```bash
+pip install -U ndx-hed
+```
+
+**Matlab:**  The Matlab extension is under development.

ndx-hed/ndx-meta.yaml

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+name: ndx-hed
+version: 0.1.0
+src: https://github.com/hed-standard/ndx-hed
+pip: https://pypi.org/project/ndx-hed/
+license: BSD
+maintainers:
+  - VisLab
+  - hed-maintainers
+