Update README.md (installation guide)

README.md

@@ -2,11 +2,18 @@
 
 ### Installation information
 
+You need to install go first: https://golang.org/doc/install
+
+After go is installed and set up, just type:
+
     $ go get gitlab.ippon.fr/ims/terraform-provider-one
+    $ go get gitlab.ippon.fr/ims/opennebula-api
+
+You can now build terraform-provider-one by going into the project folder into your $GO_PATH, and run
 
-To build this project, you will also need to clone the opennebula-api repository.
-Put both of the projets into your GO\_PATH and run go build into the provider project.
-The opennebula-api does not need to be built separately.
+    $ go build
+    
+This will create a **terraform-provider-one** that you need to put in the root of your terraform files directories.
 
 #### **ROADMAP**