add .gitignore file (and readup what it does and how it works)
add node_modules to .gitignore file, this folder must not be pushed (explanation: package.json contains all information about which modules are needed and whenever someone want to use the program, they just install all dependencies using npm install)
package.jsoncontains all information about which modules are needed and whenever someone want to use the program, they just install all dependencies usingnpm install)