Introduce README

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+A packaging harness for software of the ggml ecosystem.
+
+To use, clone recursively, for example:
+       git clone --recurse-submodules --branch unstable https://git.djapps.eu/pkg/ggml
+
+The software layers are configured as submodules under the `sources` directory.
+
+To build a layer, go to its directory and run:
+       sh ../build-pbuilder.sh <dist> <arch> [<branch>]
+
+For example:
+       cd sources/ggml
+       sh ../build-pbuilder.sh sid amd64
+or:
+       cd sources/llama.cpp
+       sh ../build-pbuilder.sh bullseye amd64 debian/bullseye