Updating the "rush add " command with "--caret" flag in Contributing.md

[HarshaNalluru]

Updating the "rush add " command with "--caret" flag.

Installing a new npm package -

• "npm install" adds ^ by default in the package.json,
• "rush add" adds ^ only when the --caret flag is specified[ in the package.json].

Example -

• rush add -p hello --caret -> "hello": "^0.3.2"
• rush add -p hello -> "hello": "~0.3.2"

[bsiegel]

Looks good to me. In the "Installing and managing dependencies" section we do document the recommendation to use the full syntax (rush add <packagename>@^<version>). This is a good addition to the table though. Thanks!

[HarshaNalluru]

Yes, Brandon.
I've seen that after Mike pointed it out to me and we thought it would be better to have it in the table as well.