patches added, more readme

Readme.md

@@ -1,6 +1,19 @@
-<!-- 
-This 'Quarto Book'https://quarto.org/ about Julia Programming in German is online at  https://www.math.uni-leipzig.de/~hellmund/juliabook/  https://www.math.uni-leipzig.de/~hellmund/juliabook/
+# Julia für Numerik
 
-It uses the  `julia-color` Quarto extension https://gitea.math.uni-leipzig.de/hellmund/julia-color
+Source code for the website and PDF ["Julia für Numerik"](https://www.math.uni-leipzig.de/~hellmund/juliabook/)
 
--->
+- It uses the [Quarto publishing system](https://quarto.org/).
+- It uses the  Quarto extension [julia-color](https://gitea.math.uni-leipzig.de/hellmund/julia-color) to support
+the conversion of Jupyter code output cells with ANSI escape sequences to HTML and LaTEX/PDF
+
+Since the `julia-color` extension needs a patched `Quarto` anyway, we use two more patches.
+
+- `patch-quarto-julia` reduces the `startup.jl` used by quarto to a minimum.
+- `patch-quarto-stacktrace` adds the julia stacktrace to the output of  code cells with julia errors. See e.g. the second code cell [here](https://www.math.uni-leipzig.de/~hellmund/juliabook/chapters/syntax.html#arithmetische-vergleiche)
+
+```shell
+cd quarto-cli
+patch -p1 < patch-quarto-julia
+patch -p1 < patch-quarto-stacktrace
+```
+All content & code licenced under [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/).