Add new catalog entry for ndx-probeinterface (#41)

ndx-probeinterface/README.md

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+# ndx-probeinterface Extension for NWB
+
+`ndx-probeinterface` is an extension of the NWB format to formally define information about neural probes as data types in NWB files. It comes with helper functions to easily construct `ndx-probeinterface.Probe` from `probeinterface.Probe` and vice versa.
+
+## Installation
+```python
+pip install ndx_probeinterface
+```
+
+## Usage
+
+### Going from a `probeinterface.Probe`/`ProbeGroup` object to a `ndx_probeinterface.Probe` object 
+```python
+import ndx_probeinterface
+
+pi_probe = probeinterface.Probe(...)
+pi_probegroup = probeinterface.ProbeGroup()
+
+# from_probeinterface always returns a list of ndx_probeinterface.Probe devices
+ndx_probes1 = ndx_probeinterface.from_probeinterface(pi_probe)
+ndx_probes2 = ndx_probeinterface.from_probeinterface(pi_probegroup)
+
+ndx_probes = ndx_probes1.extend(ndx_probes2)
+
+nwbfile = pynwb.NWBFile(...)
+
+# add Probe as NWB Devices
+for ndx_probe in ndx_probes:
+    nwbfile.add_device(ndx_probe)
+```
+
+### Going from a `ndx_probeinterface.Probe` object to a `probeinterface.Probe` object 
+```python
+import ndx_probeinterface
+
+# load ndx_probeinterface.Probe objects from NWB file
+io = pynwb.NWBH5IO(file_path, 'r', load_namespaces=True)
+nwbfile = io.read()
+
+ndx_probes = []
+for device in nwbfile:
+    if isinstance(device, ndx_probeinterface.Probe):
+        ndx_probes.append(device)
+
+# convert to probeinterface.Probe objects
+pi_probes = []
+for ndx_probe in ndx_probes:
+    pi_probe = ndx_probeinterface.to_probeinterface(ndx_probe)
+    pi_probes.append(pi_probe)
+```
+
+## Future plans
+- Add information about the headstage used for data acquisition
+- Remove redundant information from `ElectrodeTable`
+- Incorporate this NDX into the core NWB schema
+
+---
+This extension was created using [ndx-template](https://github.com/nwb-extensions/ndx-template).

ndx-probeinterface/ndx-meta.yaml

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+name: ndx-probeinterface
+version: 0.1.0
+src: https://github.com/SpikeInterface/ndx-probeinterface
+pip: https://pypi.org/project/ndx-probeinterface/
+license: MIT
+maintainers: 
+  - alejoe91
+  - khl02007