[codex] Add CITATION.cff

.Rbuildignore

@@ -27,4 +27,5 @@ _pkgdown\.yml$
 Makefile
 ^CODE_OF_CONDUCT\.md$
 ^README\.qmd$
-^AGENTS\.md$
+^AGENTS\.md$
+^CITATION\.cff$

.github/workflows/validate-citation-cff.yml

@@ -0,0 +1,24 @@
+name: Validate CITATION.cff
+
+on:
+  pull_request:
+    paths:
+      - CITATION.cff
+      - .github/workflows/validate-citation-cff.yml
+  push:
+    paths:
+      - CITATION.cff
+      - .github/workflows/validate-citation-cff.yml
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: citation-file-format/cffconvert-github-action@4cf11baa70a673bfdf9dad0acc7ee33b3f4b6084 # 2.0.0
+        with:
+          args: "--validate"

CITATION.cff

@@ -0,0 +1,37 @@
+cff-version: 1.2.0
+message: 'To cite package "ABCoptim" in publications use:'
+type: software
+license: MIT
+title: 'ABCoptim: Implementation of Artificial Bee Colony (ABC) Optimization'
+version: 0.15.0-99
+doi: 10.32614/CRAN.package.ABCoptim
+abstract: An implementation of Karaboga (2005) Artificial Bee Colony Optimization
+  algorithm <DOI:10.1007/s10898-007-9149-x>. This was developed upon the basic version
+  programmed in C and available at the algorithm's official website.
+authors:
+- family-names: Vega Yon
+  given-names: George
+  email: g.vegayon@gmail.com
+  orcid: https://orcid.org/0000-0002-3171-0844
+preferred-citation:
+  type: manual
+  title: 'ABCoptim: Implementation of Artificial Bee Colony (ABC) Optimization'
+  authors:
+  - family-names: Vega Yon
+    given-names: George
+    orcid: https://orcid.org/0000-0002-3171-0844
+    email: g.vegayon@gmail.com
+  - family-names: Mu\~noz
+    given-names: Enyelbert
+  year: '2026'
+  notes: R package version 0.15.0-99
+  url: https://github.com/gvegayon/ABCoptim
+  doi: 10.32614/CRAN.package.ABCoptim
+repository: https://CRAN.R-project.org/package=ABCoptim
+repository-code: https://github.com/gvegayon/ABCoptim
+url: https://gvegayon.github.io/ABCoptim
+contact:
+- family-names: Vega Yon
+  given-names: George
+  email: g.vegayon@gmail.com
+  orcid: https://orcid.org/0000-0002-3171-0844

NEWS.md

@@ -6,6 +6,8 @@
 
 ## Internal changes
 
+* Added repository citation metadata for GitHub and other CFF consumers.
+
 * Internal changes only. Created the BeeHive C++ template, will eventually move it to inst/include/ so that others can link to it.
 
 
@@ -29,4 +31,3 @@
 
 * Objects of class `abc_answer` return the trace of the global optimums.
 
-