Add the Unidirectional Topic Operator proposal to the index (#79)

Signed-off-by: Jakub Scholz <www@scholzj.com>

Author: scholzj

051-unidirectional-topic-operator.md

@@ -466,7 +466,7 @@ Alternatively: App could be written to wait for topic existency, or use an init
 This proposal has described a number of different configurations of a KafkaTopic and how the operator will handle them.
 The following diagram and subsections summarise the operator's behaviour on transitions between these states.
 
-![States and their transitions](051-states.png)
+![States and their transitions](images/051-states.png)
 
 Although not shown to avoid making the diagram overly complicated, the states within the dashed box are pairwise bidirectionally connected.
 

README.md

@@ -9,6 +9,7 @@ This repository list of proposals for the Strimzi project. A template for new pr
 
 |  #  | Title                                                                 |
 | :-: |:----------------------------------------------------------------------|
+| 51  | [Unidirectional Topic Operator](./051-unidirectional-topic-operator.md) |
 | 50  | [Kafka Node Pools](./050-Kafka-Node-Pools.md) |
 | 49  | [Prevent broker scale down if it contains partition replicas](./049-prevent-broker-scale-down-if-it-contains-partition-replicas.md) |
 | 48  | [Avoid broker restart when in log recovery state](./048-avoid-broker-restarts-when-in-recovery.md) |