add github labeler to set labels automatically.

.github/labeler.yml

@@ -0,0 +1,46 @@
+package:cpu:
+  - cpu/*
+package:disk:
+  - disk/*
+package:docker:
+  - docker/*
+package:host:
+  - host/*
+package:load:
+  - load/*
+package:mem:
+  - mem/*
+package:net:
+  - net/*
+package:process:
+  - process/*
+package:winservices:
+  - winservices/*
+os:linux:
+  - **/*_linux.go
+  - **/*_linux_mips64.go
+  - **/*_linux_386.go
+  - **/*_linux_test.go
+  - **/*_linux_s390x.go
+  - **/*_linux_amd64.go
+os:freebsd:
+  - **/*_freebsd.go
+  - **/*_freebsd_386.go
+  - **/*_freebsd_test.go
+  - **/*_freebsd_amd64.go
+os:darwin:
+  - **/*_darwin.go
+  - **/*_darwin_386.go
+  - **/*_darwin_test.go
+  - **/*_darwin_amd64.go
+os:openbsd:
+  - **/*_openbsd.go
+  - **/*_openbsd_386.go
+  - **/*_openbsd_test.go
+  - **/*_openbsd_amd64.go
+os:windows:
+  - **/*_windows.go
+  - **/*_windows_386.go
+  - **/*_windows_test.go
+  - **/*_windows_amd64.go
+

.github/workflows/labeler.yml

@@ -0,0 +1,11 @@
+name: "Pull Request Labeler"
+on:
+- pull_request
+
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@v2
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"