Add leading table of features to README

Author: ctrueden

README.md

@@ -5,6 +5,13 @@
 > [!NOTE]
 > **QUICK START:** [Appose Workshop](https://fiji.github.io/i2k-2025-appose/)
 
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+| <img src="https://docs.apposed.org/en/latest/_static/icons/hammer-solid-full.svg" width="24" height="24"> | **Build environments** based on community standards ([pixi](https://pixi.sh), [mamba](https://mamba.readthedocs.io/en/latest/user_guide/micromamba.html), [uv](https://docs.astral.sh/uv/)) |
+| <img src="https://docs.apposed.org/en/latest/_static/icons/code-solid-full.svg" width="24" height="24"> | **Run scripts** in those environments as worker processes |
+| <img src="https://docs.apposed.org/en/latest/_static/icons/microchip-solid-full.svg" width="24" height="24"> | **Share memory** between processes to avoid copying data |
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+
 ## What is Appose?
 
 Appose is a library for interprocess cooperation with shared memory.