Fixed credentials enforcing, updated readme

Change-Id: Ibc90ed7611fbe70f343abb297d1cc8fb6a947021
diff --git a/README.rst b/README.rst
index c74a3a1..82555d0 100644
--- a/README.rst
+++ b/README.rst
@@ -675,6 +675,18 @@
             url: https://path-to-my-library
             credential_id: github
 
+ Jenkins Global env properties enforcing
+
+ .. code-block:: yaml
+
+     jenkins:
+       client:
+         globalenvprop:
+           OFFLINE_DEPLOYMENT:
+             enabled: true
+             name: "OFFLINE_DEPLOYMENT" # optional, default using dict key
+             value: "true"
+
 Usage
 =====