Add perseus new and perseus init to CLI

[lukechu10]

This issue is requesting an enhancement to Perseus. Details of the scope will be available in issue labels.
The user described the problem related to this request as follows:

Add perseus new and perseus init commands to the cli for easy quick start.

The user described the issue as follows:

The perseus new <project_name> command, just like cargo new, should create a new minimal perseus app under the specified directory. The perseus init feature, in parallel with cargo init, should initialize the same minimal perseus app in the current existing directory.

There should also be flags for specifying VCS and eventually other options.

Unanswered questions:

• Should the cli pull the new project template from a git repository or should it be hard coded into the cli? Choosing the former would allow maximum flexibility and tweaking the template without pulling a new perseus-cli release. Choosing the later would make sure that the CLI initializes a project that corresponds to the CLI version, although that might not always be wanted.
• The author is willing to attempt an implementation: false

Tribble internal data

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[arctic-hen7]

I think this is a great idea, and I prefer pulling from a repo, but we can use branches to control the versioning. The user could also easily specify an alternative repo template that way, which would be very useful in the long term, I think.