Adding known docker issues (secure-device-onboard#62)

Adding Known Docker issues to the docker installation README file.

Signed-off-by: Davis Benny <[email protected]>

Author: DukeDavis12

docs/installation.md

@@ -93,6 +93,11 @@ sudo systemctl restart docker
 ```
 sudo systemctl show --property Environment docker
 ```
+7 . SDO Docker* FAQs
+
+  1. Docker* Time Synchronization Issue while building Ubuntu* 20 docker image from an Ubuntu* 18 machine. [Refer](https://github.com/secure-device-onboard/all-in-one-demo/issues/62)
+
+  2. Failure in device onboarding due to the inaccessibility of internet (while running Docker* behind a proxy network). [Refer](https://github.com/secure-device-onboard/all-in-one-demo/issues/63)
 
 ## Docker* Compose Installation
 To install a specific version of Docker\* Compose (for example **_1.21.2_**) follow these steps: