npm-install: add page (#14223)

pages/common/npm-install.md

@@ -0,0 +1,20 @@
+# npm install
+
+> Install node packages.
+> More information: <https://docs.npmjs.com/cli/commands/npm-install>.
+
+- Install dependencies listed in package.json:
+
+`npm install`
+
+- Download a specific version of a package and add it to the list of dependencies in `package.json`:
+
+`npm install {{package_name}}@{{version}}`
+
+- Download the latest version of a package and add it to the list of dev dependencies in `package.json`:
+
+`npm install {{package_name}} {{-D|--save-dev}}`
+
+- Download the latest version of a package and install it globally:
+
+`npm install {{-g|--global}} {{package_name}}`