Update README.md

Author: AdamTheisen

README.md

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-# ARM Repository Template
-Basic repository template with required security workflows
+# ARM SGP Lidar Intercomparison
+The U.S. Department of Energy’s Atmospheric Radiation Measurement (ARM) user facility is preparing to host a Lidar Intercomparison Campaign at its Southern Great Plains (SGP) site in Oklahoma. This effort aims to evaluate and benchmark the performance of ARM’s diverse suite of lidar systems under a range of atmospheric conditions.
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+ARM operates a wide variety of lidar instruments across its fixed and mobile facilities, including ceilometers (CL31), micropulse lidars (MPL), Doppler lidars, Raman lidars, and high-spectral-resolution lidars (HSRL). The intercomparison will also feature new systems, such as the CL61 ceilometer and a miniMPL UHD.
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+This repository shall serve as a central area for the different teams working on the analysis to share codes, results, and more.