Add README.md

README.md

+# Installation
+
+Requires only `envtpl` for module file templating:
+
+```
+pip install envtpl
+```
+
+# Usage
+
+Each directory corresponds to a library/application installation.
+It contains 2 files:
+
+- `module.tmpl`, a module file templated with Jinja2
+- `install.sh`, a bash script to be run:
+	- without argument, it downloads/compiles/installs the library + module file
+	- with `./install.sh clean`: removes the building directory
+	- with `./install.sh module`: install only the module file
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