Add "Go 101" book

README.md

@@ -53,6 +53,12 @@ This book helps Javascripters become Gophers. Outlining the differences between
 
 Learn Go guided by tests. Write a test, learn a new Go language feature to make it pass, refactor and repeat. You'll get a grounding in test-driven development and importantly understand the principles behind it. 
 
+### [Go 101](https://go101.org/article/101.html) *Free*
+
+<img src="https://go101.org/article/res/101-front-cover-1400x.jpg" width="120px"/>
+
+Go 101 is a book focusing on Go syntax/semantics and all kinds of runtime related things (Go 1.17-pre ready) and tries to help gophers gain a deep and thorough understanding of Go. This book also collects many details of Go and in Go programming. It is expected that this book is helpful for both beginner and experienced Go programmers.
+
 ### [Go in Action](https://www.manning.com/books/go-in-action)
 
 <img src="https://images.manning.com/120/160/resize/book/c/4037d5d-e5e5-49bf-a3c1-480be2907eaa/Kennedy-GO-HI.png" width="120px">