Add some details to README.

README.md

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+ognibuild
+=========
+
+Ognibuild is a simple wrapper with a common interface for invoking any kind of
+build tool.
+
+The ideas is that it can be run to build and install any source code directory
+by detecting the build system that is in use and invoking that with the correct
+parameters.
+
+It can also detect and install missing dependencies.
+
+Goals
+-----
+
+The goal of ognibuild is to provide a consistent CLI that can be used for any
+software package. It is mostly useful for automated building of
+large sets of diverse packages (e.g. different programming languages).
+
+It is not meant to expose all functionality that is present in the underlying
+build systems. To use that, invoke those build systems directly.
+
+Usage
+-----
+
+Ognibuild has a number of subcommands:
+
+ * ``ogni clean`` - remove any built artifacts
+ * ``ogni dist`` - create a source tarball
+ * ``ogni build`` - build the package in-tree
+ * ``ogni install`` - install the package
+ * ``ogni test`` - run the testsuite in the source directory
+
+License
+-------
+
+Ognibuild is licensed under the GNU GPL, v2 or later.