Parse SSHCreateBTree Arguments

[bogdandit]

Implement the parse arguments functionality in SSHCreateBTree.java.

All the unit tests defined in #3 should pass.

The expected arguments are listed in the README.md, section 5.1. Program Arguments

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Implement the parse arguments functionality in [SSHCreateBTree.java](../blob/master/src/main/java/cs321/create/SSHCreateBTree.java).

All the unit tests defined in #3 should pass.

The expected arguments are listed in the [README.md, section 5.1. Program Arguments](../blob/master/README.md#51-program-arguments)