feat: add pictures

clouds/g1/brno/vo.enes.org/terraform/README.md

@@ -10,10 +10,13 @@ Cloud-init add following:
 
 ## Infrastructure schema
 
-### 2 tiers infrastructure: public bastion and private VM farm
+### Two tier infrastructure: public bastion and private VM farm
 
-### 1 tier infrastructure: public VM farm
+![two-tier-infra.png](/clouds/common/pictures/two-tier-infra.png)
 
+### Single tier infrastructure: public VM farm
+
+![single-tier-infra.png](/clouds/common/pictures/single-tier-infra.png)
 
 ## Create Infrastructure