SH-4492 Create a useful README for llcorehttp. First edit complete.  Use the library in 15 minutes.  Describe the code.  Refinements to the initial try.  Describe that code.  Still to do:  more refinements, how to choose a policy class, FAQ.
SH-4492 Create a useful README for llcorehttp.
First edit complete.  Use the library in 15 minutes.  Describe the
code.  Refinements to the initial try.  Describe that code.  Still
to do:  more refinements, how to choose a policy class, FAQ.

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