Feature request: open file using CLI

[wicksome]

as-is

$ chrome-cli open file:$(pwd)/README.adoc

to-be

~/repo $ chrome-cli open-file README.adoc # run file:$(pwd)/README.adoc
Id: 756
Title:
Url: file:///Users/user/repo/README.adoc
Loading: Yes

~/repo $ chrome-cli open-file ./README.adoc # run file:$(pwd)/README.adoc
Id: 757
Title:
Url: file:///Users/user/repo/README.adoc
Loading: Yes

~/repo $ chrome-cli open-file /Users/user/repo2/README.adoc
Id: 758
Title:
Url: file:///Users/user/repo2/README.adoc
Loading: Yes