Add public document for the new logger

Please add public document about how to use the new logger with different parameters.

Logger instructions has been added to README file and it was merged to master.

@mengdonglin

@mengdonglin There was also update made by @mmaka1 to developer guides in sof-docs:
thesofproject/sof-docs#51

@mengdonglin

@mengdonglin Please verify if current documentation is sufficient and update this issue accordingly.

@akloniex

@akloniex @mmaka1 Thank you for the document! I close the issue.

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