nrm: add page (#2120)

pages/common/nrm.md

@@ -0,0 +1,24 @@
+# nrm
+
+> NPM registry manager.
+> Helps to easily switch between different npm registries.
+
+- List all registries:
+
+`nrm ls`
+
+- Change to a particular registry:
+
+`nrm use {{registry}}`
+
+- Show the response time for all registries:
+
+`nrm test`
+
+- Add a custom registry:
+
+`nrm add {{registry}} {{url}}`
+
+- Delete a registry:
+
+`nrm del {{registry}}`