Add warning about upcoming changes to README.md

README.md

@@ -10,6 +10,25 @@
 **Bevy XPBD** is a 2D and 3D physics engine based on _Extended Position Based Dynamics_ (XPBD)
 for the [Bevy game engine](https://bevyengine.org/).
 
+---
+
+## Warning ⚠️
+
+Bevy XPBD will undergo major changes and a rebrand during April or May.
+
+The XPBD simulation method has several potential issues, one being that it is technically patented by NVIDIA,
+and is therefore dicey to distribute in projects. We will transition away from the simulation method
+and rename the crate when we have a replacement implemented.
+
+If you are working on a project that uses Bevy XPBD, don't worry, you may continue using it.
+Just be aware of the patent, as it is technically up to the user to have the rights to distribute
+XPBD in projects. This will be addressed by the rebrand.
+
+You can find a much more in-depth explanation of the situation and plans
+[here](https://github.com/Jondolf/bevy_xpbd/issues/346).
+
+---
+
 ## Design
 
 Below are some of the core design principles used in Bevy XPBD.