Error

ng : The term 'ng' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or   
if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ ng sereve
+ ~~
    + CategoryInfo          : ObjectNotFound: (ng:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Solution

run this command

npm install -g @angular/cli