Update Readme and add license file

LICENSE

@@ -0,0 +1,22 @@
+MIT License
+
+Copyright (c) 2025 Marcel Graf
+Copyright (c) 2026 Alexander Strack
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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-# PortLBM — GPU-accelerated Lattice Boltzmann Simulations
-
-Real-time visualized, GPU-accelerated fluid simulation using the Lattice Boltzmann Method (D2Q9/BGK) with SYCL via AdaptiveCpp.
+# PortLBM: Portable GPU-accelerated Lattice Boltzmann Method Simulations
+<img align="right" width="12%" src="/images/beaverick_portlbm.jpeg">
+PortLBM is a GPU-accelerated 2D fluid simulator based on the Lattice Boltzmann Method (D2Q9 lattice, BGK collision operator). It implements four LBM algorithms across three data layouts, and targets AMD, NVIDIA, and Intel GPUs through a single SYCL codebase. An optional ImGui/ImPlot interface enables real-time visualization and interactive parameter control.
 
 ## Example Scenarios
 
@@ -126,11 +126,11 @@ All other parameters can also be adjusted from the GUI at runtime.
 
 All three layouts were proposed by [Mattila et al.](https://doi.org/10.1016/j.camwa.2007.08.001):
 
-| Value | Notes |
-| ----- | ----- |
-| `stream` | |
-| `collision` | |
-| `bundle` | |
+| Value | Description |
+| ----- | ----------- |
+| `stream` | Stores each distribution function contiguously across all nodes (Structure of Arrays). Optimises the streaming step: neighbours of the same direction are adjacent in memory. |
+| `collision` | Stores all nine distribution functions for each node contiguously (Array of Structures). Optimises the collision step: all values needed for a single node update are co-located. |
+| `bundle` | Interleaves pairs of opposite directions node by node. Reduces the working set during fused streaming–collision and can improve cache utilisation on some hardware. |
 
 ### Parameter `"frameUpdateInterval"`