Add default book

book/src/introduction.md

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+# Introduction
+
+Hello, and welcome to the [PROJECT_NAME] project.
+The goal of this project is to offer simple gateway to run script as command added by the DevOps.
+The project is composed of two principal elements.
+
+### 1. Command interpreter
+
+Interpreter is the user main interface can be accessed like BASH.
+It can be configured as default login user like that: 
+
+```shell
+useradd -s /path/to/interpreter [USER]
+```
+
+or
+
+```shell
+chsh [USER] /path/to/interpreter
+```
+
+### 2. Daemon
+
+- It's used to manage interpreter session (Kill session, list, authenticate, ....).
+- Allow external program to communicate with UNIX socket like external API or CLI.
+- Allow use HTTP or UNIX Socket external authenticator.
+It can be useful for integrate Oauth, OpenID, LDAP, ... from any language support GRPC protocol from protobuf.
+
+
+