Add the dependencies

OpenSourceLicenses.md

@@ -0,0 +1,18 @@
+This file lists the library dependencies for this plugin and their licenses.
+
+1. These libraries are downloaded automatically and linked to the final binary.
+I am not sure how android or iOS link their binaries. However, the xcode link
+command uses `-llibname` extensively, so I assume static linkage in general.
+
+1. So our primary check here is for libraries which do not have a license, or
+which are GPL licensed.
+
+# Native libraries installed via maven/cocoapods
+
+| Module | License |
+|--------|---------|
+| com.google.code.gson:gson | Apache 2.0 |
+| com.google.android.gms:play-services-auth | Proprietary (Google) |
+| Bolts/Tasks pod | BSD 3-clause |
+| CoreLocation framework | Proprietary (Apple) |
+| Accounts framework | Proprietary (Apple) |