Add stale PR policy (#1002)
Add stale PR policy (#1002)

* Add stale PR policy

* Add 1 week for stale label to be added

* fix typo

viglesiasce/charts,barklyprotects/charts,sd2k/charts,jainishshah17/charts,helm/charts,caiwenhao/charts,helm/charts,GaneshSPatil/charts,oleh-ozimok/charts,trobert2/charts-1,mluedke/charts,smileisak/charts,jainishshah17/charts,ledor473/charts,samisms/charts,sd2k/charts,viglesiasce/charts,smileisak/charts,oleh-ozimok/charts,rimusz/helm-charts,oleh-ozimok/charts,grugnog/charts,caiwenhao/charts,smileisak/charts,grugnog/charts,trobert2/charts-1,smelchior/charts,mluedke/charts,lachie83/charts,helm/charts,barklyprotects/charts,jainishshah17/charts,smelchior/charts,kachkaev/charts,mlaccetti/charts,escardin/charts,lachie83/charts,sstarcher/charts,grugnog/charts,mlaccetti/charts,samisms/charts,kachkaev/charts,mluedke/charts,GaneshSPatil/charts,sd2k/charts,smelchior/charts,mlaccetti/charts,escardin/charts,sstarcher/charts,sstarcher/charts,barklyprotects/charts,ledor473/charts,escardin/charts,rimusz/helm-charts,kachkaev/charts,ledor473/charts,lachie83/charts,helm/charts,rimusz/helm-charts,samisms/charts,trobert2/charts-1,rimusz/helm-charts,GaneshSPatil/charts,viglesiasce/charts,caiwenhao/charts,sd2k/charts,lachie83/charts,GaneshSPatil/charts