Update README.md

Dual bandpass filters used on the modified DJI Mavic 2 Pro Full-Spectrum Hasselblad can be purchased here: Both Types of Filters for sale here:

https://www.ebay.ie/itm/155859816325

https://www.ebay.ie/itm/155859834544

Author: MuonRay

README.md

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 # PythonNDVI
 Python coding that takes images acquired using a Near-Infrared (NIR) converted camera and generates a modified Normalized Differential Vegetation Index (NDVI). Contains standalone with colorbar legend and batch versions. ENDVI and SAVI Indexes also available and with greyscale options.
+Dual bandpass filters used on the modified DJI Mavic 2 Pro Full-Spectrum Hasselblad can be purchased here: Both Types of Filters for sale here:
+
+https://www.ebay.ie/itm/155859816325
+
+https://www.ebay.ie/itm/155859834544
+
+