Add introduction to book based on the README

src/README.md

@@ -0,0 +1,7 @@
+# Introduction
+
+This template allows you to get started creating your own campaign setting or supplementary rulebooks based on the [System Reference Document](https://git.tonybark.com/sixam/dnd-5e-srd-markdown) (SRD).
+
+## Declaimer
+
+Dungeons & Dragons, D&D, and their respective logos are trademarks of Wizards of the Coast LLC.

src/SUMMARY.md

@@ -1,6 +1,8 @@
 # Summary
 
-# Character
+[Introduction](README.md)
+
+# Characters
 
 - [Your character]()