Add ktx

ktx/tests/gtest/README.md

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+
+Why is gtest source included here?
+==================================
+
+1. Compiled gtest libraries are incompatible with anything but the MSVS
+   version that compiled them.
+
+2. The repo includes googlemock and a lot of other code not needed here.
+
+3. No 2 + the complexities of git submodule and git subtree make depot
+   inclusion unappealing.
+
+Note: This is bog standard gtest.