Update README.md

README.md

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 A Python package aiming to provide an easy and efficient interface to various implementations of the [Hexagonal Fast Fourier Transform](https://en.wikipedia.org/wiki/Hexagonal_fast_Fourier_transform).
 
+### Install
+
+```
+pip install hexfft
+```
+
+The only dependencies are `numpy`, `scipy`, and `matplotlib`. `pytest` is required to run the tests.
+
+#### Developer install
+
+```
+git clone [email protected]:chris-langfield/hexfft.git
+pip install -e hexfft/
+cd hexfft
+pytest tests/
+```
 
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 > R. M. Mersereau, "The processing of hexagonally sampled two-dimensional signals," in Proceedings of the IEEE, vol. 67, no. 6, pp. 930-949, June 1979, doi: 10.1109/PROC.1979.11356
 
-> Ehrhardt, J. C. (1993). Hexagonal fast Fourier transform with rectangular output. In IEEE Transactions on Signal Processing (Vol. 41, Issue 3, pp. 1469–1472). Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/78.205759 
+> Ehrhardt, J. C. (1993). Hexagonal fast Fourier transform with rectangular output. In IEEE Transactions on Signal Processing (Vol. 41, Issue 3, pp. 1469–1472). Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/78.205759