Update readme.md

prometheus-monitoring/kubernetes/readme.md

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 # Prometheus Guide
 
+Important Notice:
+-----------------
+
+To ensure I don't make any breaking changes, I have tagged the source code as a snapshot of the time the video was released.
+The tag will point to the exact source code I tested when I made the video.
+If you are using master branch, there might be breaking changes however I do my best to avoid it.
+
 ## Prometheus Overview
 
 Prometheus Overview and Architecture - Video : [here](https://youtu.be/5o37CGlNLr8) <br/>
+Source: [here](https://github.com/marcel-dempers/docker-development-youtube-series/releases/tag/prometheus-operator-1)<br/>
 
 ## Application Monitoring 
 
 Monitoring Python code with Prometheus - Video : [here](https://youtu.be/HzEiRwJP6ag) <br/>
 Monitoring Nodejs code with Prometheus - Video : [here](https://youtu.be/m2zM3zOZl34) <br/>
 Monitoring C# code with Prometheus - Video : [here](https://youtu.be/o4tdSrFnkvw) <br/>
 
+Source: [here](https://github.com/marcel-dempers/docker-development-youtube-series/releases/tag/prometheus-operator-1)<br/>
+
 ## Prometheus Operator guide
 
 Video : [here](https://youtu.be/LQpmeb7idt8) <br/>
 Source Code tested on K8s version 1.14.8 <br/>
+Source: [here](https://github.com/marcel-dempers/docker-development-youtube-series/releases/tag/prometheus-operator-1)<br/>
 
-
-More coming soon!
+More coming soon!