docs: Update README.md and LICENSE

[bkeryan]

• This contribution adheres to CONTRIBUTING.md.

What does this Pull Request accomplish?

Add more content to README.md.

Note: Hyperlinks to ReadTheDocs will be broken until we publish the docs.

Update the year in LICENSE to match the year first published.

Why should this Pull Request be merged?

Prepare for marking the repo public and publishing pre-release versions to PyPI.

What testing has been done?

None

[github-actions]

Test Results

    12 files  ± 0      12 suites  ±0   40s ⏱️ -1s
   852 tests  - 11     852 ✅  - 11  0 💤 ±0  0 ❌ ±0 
10 224 runs  ± 0  10 224 ✅ ± 0  0 💤 ±0  0 ❌ ±0 

Results for commit cab1598. ± Comparison against base commit b60ff50.

This pull request removes 11 tests.

tests.unit.waveform.test_analog_waveform ‑ test___various_values___repr___looks_ok[value12-nitypes.waveform.AnalogWaveform(3, int32, raw_data=array([1, 2, 3]), timing=nitypes.waveform.Timing(nitypes.waveform.SampleIntervalMode.REGULAR, sample_interval=datetime.timedelta(microseconds=1000)))]
tests.unit.waveform.test_analog_waveform ‑ test___various_values___repr___looks_ok[value13-nitypes.waveform.AnalogWaveform(3, int32, raw_data=array([1, 2, 3]), extended_properties={'NI_ChannelName': 'Dev1/ai0', 'NI_UnitDescription': 'Volts'})]
tests.unit.waveform.test_analog_waveform ‑ test___various_values___repr___looks_ok[value14-nitypes.waveform.AnalogWaveform(3, int32, raw_data=array([1, 2, 3]), scale_mode=nitypes.waveform.LinearScaleMode(2.0, 1.0))]
tests.unit.waveform.test_analog_waveform ‑ test___various_values___repr___looks_ok[value4-nitypes.waveform.AnalogWaveform(5, int32, raw_data=array([0, 0, 0, 0, 0]))]
tests.unit.waveform.test_analog_waveform ‑ test___various_values___repr___looks_ok[value5-nitypes.waveform.AnalogWaveform(5, int32, raw_data=array([0, 0, 0, 0, 0]))]
tests.unit.waveform.test_analog_waveform ‑ test___various_values___repr___looks_ok[value7-nitypes.waveform.AnalogWaveform(3, int32, raw_data=array([1, 2, 3]))]
tests.unit.waveform.test_spectrum ‑ test___various_values___repr___looks_ok[value10-nitypes.waveform.Spectrum(3, int32, data=array([1, 2, 3]), extended_properties={'NI_ChannelName': 'Dev1/ai0', 'NI_UnitDescription': 'Volts'})]
tests.unit.waveform.test_spectrum ‑ test___various_values___repr___looks_ok[value4-nitypes.waveform.Spectrum(5, int32, data=array([0, 0, 0, 0, 0]))]
tests.unit.waveform.test_spectrum ‑ test___various_values___repr___looks_ok[value5-nitypes.waveform.Spectrum(5, int32, data=array([0, 0, 0, 0, 0]))]
tests.unit.waveform.test_spectrum ‑ test___various_values___repr___looks_ok[value7-nitypes.waveform.Spectrum(3, int32, data=array([1, 2, 3]))]
…