Add auto labeler workflow

.github/labeler.yml

@@ -0,0 +1,35 @@
+"Category: CI":
+  - .github/workflows/*
+
+"Category: Meta":
+  - ./*
+  - .github/*
+  - .github/ISSUE_TEMPLATE/*
+  - .github/PULL_REQUEST_TEMPLATE/*
+  - .gitignore
+
+"Category: Build System":
+  - meson.build
+  - meson_options.txt
+  - subprojects/*
+
+"Category: Documentation":
+  - docs/*
+
+"Category: Resources":
+  - resources/*
+
+"Category: Themes":
+  - data/colors/*
+
+"Category: Lua Core":
+  - data/core/*
+
+"Category: Fonts":
+  - data/fonts/*
+
+"Category: Plugins":
+  - data/plugins/*
+
+"Category: C Core":
+  - src/*

.github/workflows/auto_labeler_pr.yml

@@ -0,0 +1,16 @@
+name: "Pull Request Labeler"
+on:
+- pull_request_target
+
+permissions:
+  pull-requests: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Apply Type Label
+        uses: actions/labeler@v3
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          sync-labels: ""  # works around actions/labeler#104