Add actions/labeler for auto label PRs (#1193)

* Add labler github action for auto labeling of PRs

Signed-off-by: Hung-Han (Henry) Chen <1474479+chenhunghan@users.noreply.github.com>

* Add new label area/ci

Signed-off-by: Hung-Han (Henry) Chen <1474479+chenhunghan@users.noreply.github.com>

* Auto label PR when changes on .azure-pipelines.yml and docs/**/*

Signed-off-by: Hung-Han (Henry) Chen <1474479+chenhunghan@users.noreply.github.com>

* Typo READEME.md > README.md

Signed-off-by: Hung-Han (Henry) Chen <1474479+chenhunghan@users.noreply.github.com>

.github/labeler-config.yml

@@ -0,0 +1,17 @@
+---
+area/ui:
+  - src/renderer/**/*
+area/test:
+  - integration/**/*
+  - __mocks__/**/*
+area/extension:
+  - extensions/**/*
+  - src/extensions/**/*
+area/documentation:
+  - README.md
+  - docs/**/*
+area/ci:
+  - .github/workflows/**/*
+  - .azure-pipelines.yml
+dependencies:
+  - yarn.lock