Update README.md

[ROCm/rocm_smi_lib commit: 88e3eadac7]

projects/rocm-smi-lib/README.md

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 C++ Library interface for ROCm-SMI to allow you to monitor/trace GPU system atributes 
 
+For developer Familer with NVML here is our key to understand our API 
+
 | NVML API	| Type |	Sub-type	| Rocm-smi equivalent API  |
 |-------------------|--------|---------------|-----------------------------------|
 | **Power State**  | | | |