postinstall command put in package.json

[hkwathome]

postinstall command is added in package.json to excute scripts/postinstall.sh , it executes shell script called postinstall.sh to do backup as original package.json as npm audit fix --force updates the user written package.json and there is no backup of package.json currently done , Thus original package.json gets lost , unless the Project is git maintained , and npm audit fix --force can be reversed by developer , and user may want to restore his original package.json .
this creates a backup of original package.json at the time of "npm install" itself , this is tested with same modification to create-react-app new sample project, however react team can review the need to echo and take backup of package.json file postinstall.sh needs to be put in scripts folder in the project

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