add citation to usage.rst (#1208)

* add citation 

closes #1179

* Update USAGE.rst

Co-authored-by: Robbi Bishop-Taylor <Robbi.BishopTaylor@ga.gov.au>

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Co-authored-by: Robbi Bishop-Taylor <Robbi.BishopTaylor@ga.gov.au>

USAGE.rst

@@ -29,6 +29,8 @@ Scientific papers
 
 - Dunn, B., Lymburner, L., Newey, V., Hicks, A. and Carey, H., 2019. Developing a Tool for Wetland Characterization Using Fractional Cover, Tasseled Cap Wetness And Water Observations From Space. IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019, pp. 6095-6097. https://doi.org/10.1109/IGARSS.2019.8897806
 
+- Gale, M.G., Cary, G.J., van Dijk, A.I.J.M., Yebra, M., 2023. Untangling fuel, weather and management effects on fire severity: Insights from large-sample LiDAR remote sensing analysis of conditions preceding the 2019-20 Australian wildfires. Journal of Environmental Management, Volume 348, p.119474, ISSN 0301-4797. https://doi.org/10.1016/j.jenvman.2023.119474
+
 - Krause, C.E., Newey, V., Alger, M.J. and Lymburner, L., 2021. Mapping and monitoring the multi-decadal dynamics of Australia’s open waterbodies using Landsat. Remote Sensing, 13(8), p.1437.
 
 - Malan, N., Roughan, M., Hemming, M. et al. Quantifying coastal freshwater extremes during unprecedented rainfall using long timeseries multi-platform salinity observations. Nat Commun 15, 424 (2024). https://doi.org/10.1038/s41467-023-44398-2