Added README files for some project components.

README.md

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+{{{project-name}}} is currently under development.
+
+It aims to become a multi-platform document-oriented operating system.

build-system/README.md

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+Simple build system.
+
+* Purely functional
+* Runs commands in isolated environments (virtual machine or `chroot` or `proot` with `env -i`)
+* Inputs are distinguished at the syntactic level, and dependencies are automatically computed
+* Does not rely on filesystem timestamps
+* Results are memoized (if an output happens to be the same after regeneration, it will not be seen as an updated dependency)

chameleon/README.md

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+Build rules to generate different file types. The rules for more than one file type can be applied, as long as the resulting bytes generated by each rule are the same for the same offsets.

micro-scheme/README.md

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+# A tiny scheme implemented in POSIX SH

run-in-emulator/README.md

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+# Uniform interface to many emulators and virtual machines (QEMU, Bochs, VirtualBox, chroot, …)

subimage-search/README.md

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+Reasonably fast search of an image in a larger one.
+
+Used for GUI tests (e.g. to detect whether a button appears and click on it with xdotool).

vm/README.md

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+A simple virtual machine (in the programming language runtime sense), used to abstract many hardware backends.