[Documentation] Create CITATION.cff

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     permissions:
       contents: none
     name: CI
-    needs: [test, check, docs, rustfmt, clippy]
+    needs: [test, check, docs, rustfmt, clippy, cffconvert]
     runs-on: ubuntu-latest
     steps:
       - name: Done
@@ -187,3 +187,15 @@ jobs:
       run: make clippy-full
     - name: Lint (release)
       run: make clippy-release
+  cffconvert:
+    name: cffconvert
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          persist-credentials: false
+      - name: CFF validation
+        uses: citation-file-format/cffconvert-github-action@2.0.0
+        with:
+          args: --validate

CITATION.cff

@@ -0,0 +1,22 @@
+# Parser settings.
+cff-version: 1.2.0
+message: Please cite this crate using these information.
+
+# Version information.
+date-released: 2023-02-28
+version: 4.1.8
+
+# Project information.
+abstract: A full featured, fast Command Line Argument Parser for Rust
+authors:
+  - alias: kbknapp
+    family-names: Knapp
+    given-names: Kevin B.
+  - name: The Clap Community
+license:
+  - Apache-2.0
+  - MIT
+repository-artifact: https://crates.io/crates/clap
+repository-code: https://github.com/clap-rs/clap
+title: clap
+url: https://docs.rs/clap

Cargo.toml

@@ -57,6 +57,8 @@ pre-release-replacements = [
   {file="CHANGELOG.md", search="ReleaseDate", replace="{{date}}", min=1},
   {file="CHANGELOG.md", search="<!-- next-header -->", replace="<!-- next-header -->\n## [Unreleased] - ReleaseDate\n", exactly=1},
   {file="CHANGELOG.md", search="<!-- next-url -->", replace="<!-- next-url -->\n[Unreleased]: https://github.com/clap-rs/clap/compare/{{tag_name}}...HEAD", exactly=1},
+  {file="CITATION.cff", search="^date-released: ....-..-..", replace="date-released: {{date}}"},
+  {file="CITATION.cff", search="^version: .+\\..+\\..+", replace="version: {{version}}"},
 ]
 
 [features]