Add initial 1.3 readme

Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>

README.md

@@ -6,7 +6,7 @@
 
    The SPDM and secured message libraries follow :
 
-   [DSP0274](https://www.dmtf.org/dsp/DSP0274)  Security Protocol and Data Model (SPDM) Specification (version [1.0.1](https://www.dmtf.org/sites/default/files/standards/documents/DSP0274_1.0.1.pdf), version [1.1.2](https://www.dmtf.org/sites/default/files/standards/documents/DSP0274_1.1.2.pdf) and version [1.2.1](https://www.dmtf.org/sites/default/files/standards/documents/DSP0274_1.2.1.pdf))
+   [DSP0274](https://www.dmtf.org/dsp/DSP0274)  Security Protocol and Data Model (SPDM) Specification (version [1.0.2](https://www.dmtf.org/sites/default/files/standards/documents/DSP0274_1.0.2.pdf), version [1.1.3](https://www.dmtf.org/sites/default/files/standards/documents/DSP0274_1.1.3.pdf), version [1.2.2](https://www.dmtf.org/sites/default/files/standards/documents/DSP0274_1.2.2.pdf) and version [1.3.0](https://www.dmtf.org/sites/default/files/standards/documents/DSP0274_1.3.0.pdf))
 
    [DSP0277](https://www.dmtf.org/dsp/DSP0277)  Secured Messages using SPDM Specification (version [1.1.0](https://www.dmtf.org/sites/default/files/standards/documents/DSP0277_1.1.0.pdf))
 
@@ -38,6 +38,8 @@
 
    SPDM 1.2: `GET_CSR`, `SET_CERTIFICATE`, `CHUNK_SEND`, and `CHUNK_GET`.
 
+   SPDM 1.3: No new commands are supported at this momemnt. No new SPDM 1.3 features are supported.
+
 5) Cryptography Support
 
    The SPDM library requires [cryptolib API](https://github.com/DMTF/libspdm/blob/main/include/hal/library/cryptlib.h), including random number generation, symmetric cryptography, asymmetric cryptography, hash, and message authentication code.