[PROD-3433] Fix npm install script issue

[kishanbuddyboss]

Jira Issue:

https://buddyboss.atlassian.net/browse/PROD-3433

General Note

Added .nvmrc file so any developer can use version describe in the .nvmrc file.

They just need to run command line nvm use. So their node version will changed to 14 and they won't need to troubleshoot the issue.

Notes to Developer

• Ensure the IDs (i.e. PROD-1) of all associated Jira issues are reference in this PR’s title
• Ensure that you have achieved the Definition of Done before submitting for review
• When this PR is ready for review, move the associate Jira issue(s) to “Needs Review” (or “Code Review” for Dev Tasks)

Notes to Reviewer

• Install node using nvm
• To get an error you can install latest version of the Node and run npm install in plugin root directory.
• To resolve error run nvm use and it change the node version to 14

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