Add root level README.md

README.md

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+# The Tendermint light client enclave
+
+This enclave runs tendermint/CometBFT light client verification on a given 'verification trace' using a user specified
+root-of-trust. It outputs the new root-of-trust to a sealed file so that it can be used for future instantiations.
+
+## Execution on an SGX machine
+
+This is tested on a local SGX machine, not Azure
+
+```bash
+docker build . --tag tmdocker build . --tag tm \
+docker run -it --device /dev/sgx_enclave \
+      -v /var/run/aesmd/aesm.socket:/var/run/aesmd/aesm.socket \
+      -v ./tests:/workdir/tests \
+      tm bash
+is-sgx-available
+gramine-sgx ./tm
+```