Docs: need usage example in README.md

[masenf]

1. using Pike in interactive Python
2. using Pike like an SMB client
3. using Pike to write unittests
4. using Pike with pytest

The existing tests under pike.test aren't necessarily the best examples and we don't really want people copying the bad patterns.

Would be good to have some python3, pytest, pike.test.TreeConnect examples in place showing the most common API calls and linking into the generated documentation for full details.

[jtmoon79]

My specific suggestions for each example.

Example using Pike in interactive Python

Use literal values, no variables. No with statements. Maybe inspect a share with it.

Example using Pike like an SMB client

Use more variables. Maybe a def to wrap operations. use with statements. Maybe cd a path and download a file. imagine using pike like one might use smbclient.

Example using Pike to write unittests

Write a basic unittest-based test case.

Example using Pike with pytest

Write a basic pytest-based test case.