Introduce Swiftlint

.github/workflows/swiftlint.yaml

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+on:
+  pull_request:
+    paths:
+      - '.github/workflows/swiftlint.yml'
+      - '.swiftlint.yml'
+      - '**/*.swift'
+
+name: SwiftLint
+
+jobs:
+  SwiftLint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: GitHub Action for SwiftLint
+        uses: norio-nomura/action-swiftlint@master

.swiftlint.yml

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+only_rules:
+  - line_length
+  - vertical_whitespace
+  - redundant_discardable_let
+  - unused_closure_parameter
+  - mark
+  - implicit_getter
+  - trailing_comma
+  - orphaned_doc_comment
+  - control_statement
+  - multiple_closures_with_trailing_closure
+  - opening_brace
+  - empty_enum_arguments
+  - for_where
+  - redundant_string_enum_value
+  - colon
+  - syntactic_sugar
+
+line_length: 100