Add pull request template for new icons (#312)

* Create new-icon.md

* Use proper label for icon request issue template

* Use proper label for bug report template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,7 +1,7 @@
 ---
 name: Bug report
 about: Create a report to help us improve
-labels: bug
+labels: "🐛 bug"
 ---
 
 <!--

.github/ISSUE_TEMPLATE/icon_request.md

@@ -1,7 +1,7 @@
 ---
 name: Icon request
 about: Suggest an new icon for this project
-labels: "icon request"
+labels: "🙌 icon request"
 ---
 
 <!--

.github/PULL_REQUEST_TEMPLATE/new-icon.md

@@ -0,0 +1,14 @@
+---
+name: New icon
+about: Add a new icon to the library
+labels: "🎨 <icon"
+---
+
+<!-- Thanks for submitting an icon! Please make sure you read the icon design guide
+at https://github.com/lucide-icons/lucide/blob/master/docs/ICON_DESIGN_GUIDE.md beforehand,
+and please fill everything below. -->
+
+- **Name of the icon** : <!-- `icon` -->
+- **What is the purpose of this icon?** : <!-- Shows that one can click it to... / Is used to denote or label... -->
+- **100% scale preview** : <!-- upload an image -->
+- **Have you considered alternative possibilities** for its naming or design? :