create README.md for mesatee_cli (#22)

* create README.md for mesatee_cli

mesatee_cli/README.md

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+# MesaTEE CLI
+
+`mesatee-cli` is a command-line utility to communicate with MesaTEE external
+endpoints. 
+
+## Usage
+
+```shell
+mesatee_cli 0.1.0
+MesaTEE Authors <developers@mesatee.org>
+MeasTEE client
+
+USAGE:
+    mesatee_cli [FLAGS] [OPTIONS] <IP_ADDRESS:PORT> --auditor_keys <auditor_keys>... --auditor_sigs <auditor_sigs>... --enclave_info <enclave_info> --endpoint <endpoint>
+
+FLAGS:
+    -h, --help
+            Prints help information
+
+    -P, --pretty
+            Enable pretty printing.
+
+    -V, --version
+            Prints version information
+
+    -v, --verbosity
+            Pass many times for more log output
+
+            By default, it'll only report errors. Passing `-v` one time also prints warnings, `-vv` enables info
+            logging, `-vvv` debug, and `-vvvv` trace.
+
+OPTIONS:
+    -o, --output <IN_FILE>
+            Write to FILE instead of stdout
+
+    -i, --input <OUT_FILE>
+            Read from FILE instead of stdin
+    
+    -k, --auditor_keys <auditor_keys>...
+            SPACE seperated paths of MesaTEE auditor public keys
+    
+    -s, --auditor_sigs <auditor_sigs>...
+            SPACE seperated paths of MesaTEE auditor endorsement signatures.
+    
+    -c, --enclave_info <enclave_info>
+            Path to Enclave info file
+    
+    -e, --endpoint <endpoint>
+            MesaTEE endpoint to connect to. Possible values are: tms, tdfs, fns.
+
+ARGS:
+    <IP_ADDRESS:PORT>
+            Address and port of the MeasTEE endpoint
+```
+
+Note the `--enclave_info`, `--auditor_keys`, `--auditor_sigs` are required
+options. These flags provide auditor information for MesaTEE enclaves. More
+details can be found
+[here](https://github.com/mesalock-linux/mesatee/blob/master/auditors/README.md).
+
+
+## Example
+
+Here we give an example of using `mesatee_cli`:
+
+```shell
+$ cd mesatee
+$ ./service.sh start
+$ ./bin/mesatee_cli 127.0.0.1:5554 -k auditors/albus_dumbledore/albus_dumbledore.public.der -k auditors/godzilla/godzilla.public.der -k auditors/optimus_prime/optimus_prime.public.der -s auditors/albus_dumbledore/albus_dumbledore.sign.sha256 -s auditors/godzilla/godzilla.sign.sha256 -s auditors/optimus_prime/optimus_prime.sign.sha256 -c out/enclave_info.txt --endpoint tms -i ~/tms_payload
+
+{"type":"Create","task_id":"7216dd3e-ab3a-4974-b03e-3833891bbb26","task_token":"08e0d4c807700ff24d31ca01d8695b61","ip":"127.0.0.1","port":3444}
+```