[Feature] Added minimal cli

[jtara1]

No description provided.

[jtara1]

we can test this by checking out my branch, installing the module locally like npm i -g ., jsonata my-file.json SomeExpression or just have the only positional arg be the <expression> and pipe or redirect the file contents

[coveralls]

Coverage remained the same at 100.0% when pulling 1936150 on jtara1:master into d9bbcce on jsonata-js:master.