Add linting.

Author: samikeijonen

.editorconfig

@@ -0,0 +1,17 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.js]
+indent_style = space
+indent_size = 4
+
+[*.scss]
+indent_style = space
+indent_size = 4
+
+[*.php]
+indent_style = space
+indent_size = 4

.eslintrc.js

@@ -0,0 +1,8 @@
+module.exports = {
+	root: true,
+	extends: ['plugin:@wordpress/eslint-plugin/recommended'],
+	rules: {
+		// Use spaces.
+		indent: ['error', 4],
+	},
+};

.gitignore

@@ -0,0 +1,36 @@
+# WP-CLI database dumps that should not be tracked in git
+db-sync
+sql-dump-*.sql
+
+# Custon environment variables may include passwords and other
+# secrets and should not be tracked in git
+.env
+.env.*
+!.env.example
+
+# Libraries installed by Composer, Bower etc
+vendor/*
+!vendor/.gitkeep
+
+# Node Package Manager
+node_modules
+
+# Vagrant run-time output, not need to track in git
+bin
+.vagrant
+myrecording
+
+# Don't store any logs in version control
+*.log
+
+# OSX Desktop Services Store files.
+.DS_Store
+
+.idea
+
+# Regression test results
+routes.json
+backstop_data
+
+# VS Code related.
+.vscode