Docs: Update README.md (#1206)

adding information about the main branch and quality

---------

Co-authored-by: MateuszGrabuszynski <[email protected]>
Co-authored-by: DawidWesierski4 <[email protected]>
Co-authored-by: KarolinaPomian <[email protected]>

Author: 4 people

README.md

@@ -2,13 +2,17 @@
 
 > [!TIP]
 > [Full Documentation](https://openvisualcloud.github.io/Media-Transport-Library/README.html) for [Media Transport Library](https://openvisualcloud.github.io/Media-Transport-Library/README.html).
+
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+> [!IMPORTANT]  
+> All Source code and features on the main branch are for the purpose of testing or evaluation and not production ready. Evaluated code is tagged with the corresponding release version.
+
 ## 1. Overview
 
 The Media Transport Library(MTL) is a software based solution designed for high-throughput, low-latency transmission and reception of media data. It features an efficient user-space LibOS UDP stack specifically crafted for media transport, and comes equipped with a built-in SMPTE ST 2110-compliant implementation for Professional Media over Managed IP Networks.