Add editorconfig and matching Github Workflow.

.editorconfig

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+# @see https://editorconfig.org/
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+max_line_length = 100
+
+[*.{md,markdown}]
+trim_trailing_whitespace = false
+
+[*.{yml,yaml}]
+indent_size = 2
+max_line_length = off
+
+[{bw-dev,fr-dev,LICENSE}]
+max_line_length = off
+
+[*.{csv,json,html,md,po,py,svg,tsv}]
+max_line_length = off
+
+[fonts/**]
+insert_final_newline = unset

.github/workflows/linters-global.yaml

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+# @url https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions
+name: Global Linters
+
+on:
+  push:
+    branches: [ main, ci ]
+  pull_request:
+    branches: [ main, ci ]
+
+jobs:
+  linters:
+    name: linters
+    runs-on: ubuntu-20.04
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+
+      - name: EditorConfig lint
+        uses: greut/eclint-action@v0