Add integration of Javacard SDKs

README.md

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+# Crystal
+
+Running Post-Quantum Cryptography (Kyber) on [JavaCard 2.2.1](https://www.cardlogix.com/product/cardlogix-credentsys-lite-java-card-72k/)
+
+## Setup
+
+This requires JDK 11 and Apache Ant to be installed with their environment variables set and `bin` directories added to the environment's `PATH`.
+
+Run this to setup the SDK environment:
+
+```bash
+git submodule update --init --recursive
+souce env
+ant setup
+```