Add .gitignore, update template.yml and template.tex for new document structure, and include example markdown file

template.yml

@@ -3,12 +3,20 @@ title: 'Cours 4.0'
 description: 'Cours4.0 Template'
 version: 1.0.0
 license: MIT
-source: 'https://example.com/author-guidelines/latex-submission'
+thumbnail: ./thumbnail.png
+authors:
+  - name: Edgar P. Burkhart
+source: 'https://git.edgarpierre.fr/edpibu/courstex'
 tags:
   - paper
 doc:
   - id: title
     required: true
+  - id: authors
+    required: true
+  - id: affiliations
+    required: false
+  - id: date
 files:
   - template.tex
 packages: