chore: add documentation_improvement.md issue template (#145)

Co-authored-by: ManonPolle <46710837+ManonPolle@users.noreply.github.com>

.github/ISSUE_TEMPLATE/documentation_improvement.md

@@ -0,0 +1,24 @@
+---
+name: Documentation improvement
+about: Create an issue to improve documentation
+title: 'docs: '
+labels: documentation 📝
+---
+
+<!-- 
+    Before submitting an issue, please consult our [documentation](https://decathlon.design). 
+    Please make sure you are posting an issue pertaining to the Decathlon Design System. 
+
+    Note that before opening an issue, you can chat maintainer of this project on channel
+    #dev-android in [Decathlon Design System's Slack(https://join.slack.com/t/decathlon-design/shared_invite/zt-ou0n9qas-n_oamDSVUIqvLqNO1LETJg).
+
+    If you want to know how to contribute to this project, you can check our CONTRIBUTING file:
+    https://github.com/Decathlon/vitamin-compose/blob/main/CONTRIBUTING.md
+
+    If a section isn't adapted for your request, please remove it to avoid any unnecessary section.
+
+    Thanks!
+-->
+
+**Description**
+<!-- A clear and concise description of what is the documentation improvement that you propose. -->