[MAINT] add citation.cff file and validation workflow (#55)

* add cff file

* add dependabot

.github/dependabot.yml

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+---
+# Documentation
+# https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+version: 2
+updates:
+-   package-ecosystem: github-actions
+    directory: /
+    schedule:
+        interval: monthly

.github/workflows/validate_cff.yml

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+---
+name: validate CITATION.cff
+
+on:
+    push:
+        branches: main
+    pull_request:
+        branches: ['*']
+
+jobs:
+    validate_cff:
+        runs-on: ubuntu-latest
+        steps:
+        -   uses: actions/checkout@v4
+        -   name: Check whether the citation metadata from CITATION.cff is valid
+            uses: citation-file-format/[email protected]
+            with:
+                args: --validate

CITATION.cff

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+cff-version: 1.2.0
+
+title: "giga_connectome"
+
+version: 0.4.1dev
+
+abstract:
+  "generate connectome from fMRIPrep outputs."
+
+message: "If you use this software, please cite it as below."
+
+repository-code: "https://github.com/SIMEXP/giga_connectome"
+
+contact:
+  - email: [email protected]
+    family-names: Wang
+    given-names: Hao-Ting
+
+authors:
+  - family-names: Wang
+    given-names: Hao-Ting
+    email: [email protected]
+  - family-names: Dessain
+    given-names: Quentin
+  - family-names: Natasha 
+    given-names: Clarke
+
+
+license: MIT