test: update documentations

Signed-off-by: Amirreza Zarrabi <[email protected]>

Author: qc-azarrabi

tests/README.md

@@ -3,4 +3,7 @@
 You can run the `unittest` binary with the following commands:
 
 - _QTEE Diagnostics_ `unittest -d`
-- _TA loading and running command_ `unittest -l /path/to/ta cmd`
+- _TA loading and running command_ `unittest -l <path to TA binary> <type> <command>`
+  type is 0 to use TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INPUT or
+          1 to use TEE_IOC_SHM_ALLOC for memory sharing.
+  command is 0