Add CFG2 cross matching notebook

all_sky_galactic_chandra_fermi_gaia_2mass/README.md

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+# Galactic Source Study From IR to Gamma-ray
+
+In this User Case we obtain multiwavelength information for sources located in the Galactic plane from Chandra, Fermi-LAT, GAIA, and 2MASS observations. 
+
+
+
+```{toctree}
+---
+maxdepth: 1
+---
+
+all_sky_galactic_chandra_fermi_gaia_2mass
+
+```