Started gitbook in docs folder

Change-Id: Ifda129c3202855bba16a7c77e35b4351c9773655
diff --git a/.gitignore b/.gitignore
index 73ddaa1..79d5503 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,4 +31,5 @@
 containers/xos/local_certs.crt
 containers/xos/tmp.chameleon/
 containers/xos/BUILD/
-venv-xos/
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+venv-xos/
+_book/
diff --git a/book.json b/book.json
new file mode 100644
index 0000000..be589bb
--- /dev/null
+++ b/book.json
@@ -0,0 +1,4 @@
+{
+  "title": "XOS-GUI User Documentation",
+  "root": "./docs"
+}
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diff --git a/docs/.gitignore b/docs/.gitignore
new file mode 100644
index 0000000..8bec8ec
--- /dev/null
+++ b/docs/.gitignore
@@ -0,0 +1 @@
+_book/
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diff --git a/docs/README.md b/docs/README.md
new file mode 100644
index 0000000..76ca47c
--- /dev/null
+++ b/docs/README.md
@@ -0,0 +1,4 @@
+# XOS
+
+Welcome to the XOS documentation.
+
diff --git a/docs/SUMMARY.md b/docs/SUMMARY.md
new file mode 100644
index 0000000..5f0b842
--- /dev/null
+++ b/docs/SUMMARY.md
@@ -0,0 +1,5 @@
+# Summary
+
+* [Introduction](README.md)
+    - [Contribute to the documentation](contribute_docs.md)
+
diff --git a/docs/contribute_docs.md b/docs/contribute_docs.md
new file mode 100644
index 0000000..6b3419b
--- /dev/null
+++ b/docs/contribute_docs.md
@@ -0,0 +1,15 @@
+# Contribute to the documentation
+
+The XOS documentation is generated using [GitBooks](https://www.gitbook.com) and you can learn more about the GitBooks Toolchain [here](https://toolchain.gitbook.com/)
+
+## View the documentation as a website
+
+If you have [NodeJs](https://nodejs.org/en/) installed in your system, you can easily install the `gitbook-cli` using:
+```
+npm install gitbook-cli -g
+```
+
+and then serve the documentation with:
+```
+gitbook serve
+```
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