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Creates a new Phoenix web project within an umbrella project.

It expects the name of the otp app as the first argument and
for the command to be run inside your umbrella application's
apps directory:

    $ cd my_umbrella/apps
    $ mix phx.new.web APP [--module MODULE] [--app APP]

This task is intended to create a bare Phoenix project without
database integration, which interfaces with your greater
umbrella application(s).

## Examples

    mix phx.new.web hello_web

Is equivalent to:

    mix phx.new.web hello_web --module HelloWeb

Supports the same options as the `phx.new` task.
See `Mix.Tasks.Phx.New` for details.
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