npm-name: add page (#6924)

pages/common/npm-name.md

@@ -0,0 +1,12 @@
+# npm-name
+
+> Check whether a package or organization name is available on npm.
+> More information: <https://github.com/sindresorhus/npm-name-cli>.
+
+- Check if a specific package name is available in the npm registry:
+
+`npm-name {{package}}`
+
+- Find similar package names in the npm registry:
+
+`npm-name --similar {{package}}`