swtpm: Initial documentation

docs/SWTPM.md

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+# Using wolfTPM with SWTPM
+
+wolfTPM is to be able to interface with SW TPM interfaces defined by section D.3 of
+[TPM-Rev-2.0-Part-4-Supporting-Routines-01.38-code](https://trustedcomputinggroup.org/wp-content/uploads/TPM-Rev-2.0-Part-4-Supporting-Routines-01.38-code.pdf)
+
+Using the socket connection for SWTPM is exclusive and not compatible with TIS or devtpm.
+
+Only a subset of functionality is implemented to support testing of wolfTPM. The platform requests are not used by wolfTPM.
+
+Two implementations were used in testing:
+* http://ibmswtpm.sourceforge.net/
+* https://github.com/stefanberger/swtpm
+
+## Building with SW TPM support
+```
+./configure --enable-swtpm
+make
+```
+
+## Starting SWTPM simulator
+
+```
+git clone https://github.com/kgoldman/ibmswtpm2.git
+cd ibmswtpm2/src/
+make
+```
+
+```
+./tpm_server --rm
+```
+
+The rm switch is optional and remove the cache file
+NVChip. Alternately you can `rm NVChip`
+
+## Running examples
+
+```
+./examples/pcr/extend
+./examples/wrap/wrap_test
+```