Update issue templates for proposing new book chapters.

Author: oraqlle

Diff for: .github/ISSUE_TEMPLATE/add-chapter.md

@@ -0,0 +1,20 @@
+---
+name: Add Chapter
+about: Information needed to plan a new chapter
+title: 'Chapter 0 - Name '
+labels: add-chapter
+assignees: ''
+
+---
+
+## Synopsis
+
+About
+
+## Pages
+
+- [ ] ABC
+
+## Supporting Pages
+
+- [ ] ABC

Diff for: .github/ISSUE_TEMPLATE/add-project-chapter.md

@@ -0,0 +1,16 @@
+---
+name: Add Project Chapter
+about: Information needed to plan a new project chapter
+title: "[Project] Chapter 0 - Name"
+labels: add-chapter, add-project-chapter
+assignees: ''
+
+---
+
+## Synopsis
+
+About
+
+## Pages
+
+- [ ] ABC