Add dedicated INSTALL guide and update README

No new ideas here. Existing content slightly restructured, with
some wiki content mixed in.

INSTALL.md

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+# BlueALSA Installation
+
+Given its aim of small size and minimum redundancy, BlueALSA makes many of its
+features optional and only includes them when explicitly requested when
+configuring the build. The number of options is therefore large, too large to
+be covered fully here. For a comprehensive installation guide, please look at
+the [Installation from source][] project wiki page. If you've found something
+missing or incorrect, feel free to make a wiki contribution.
+
+[Installation from source]: https://github.com/Arkq/bluez-alsa/wiki/Installation-from-source
+
+## Configuration
+
+Firstly, create the `configure` script. Run, in the top level project
+directory:
+
+```sh
+autoreconf --install
+```
+
+then, to see a complete list of all options:
+
+```sh
+./configure --help
+```
+
+Dependencies:
+
+- [alsa-lib](https://www.alsa-project.org/)
+- [bluez](http://www.bluez.org/) >= 5.0
+- [glib](https://wiki.gnome.org/Projects/GLib) with GIO support
+- [sbc](https://git.kernel.org/cgit/bluetooth/sbc.git)
+- [docutils](https://docutils.sourceforge.io) (when man pages build is enabled
+  with `--enable-manpages`)
+- [fdk-aac](https://github.com/mstorsjo/fdk-aac) (when AAC support is enabled
+  with `--enable-aac`)
+- [lc3plus](https://www.iis.fraunhofer.de/en/ff/amm/communication/lc3.html)
+  (when LC3plus support is enabled with `--enable-lc3plus`)
+- [libldac](https://github.com/EHfive/ldacBT) (when LDAC support is enabled
+  with `--enable-ldac`)
+- [libopenaptx](https://github.com/pali/libopenaptx) (when apt-X support is
+  enabled and `--with-libopenaptx` is used)
+- [mp3lame](https://lame.sourceforge.net/) (when MP3 support is enabled with
+  `--enable-mp3lame`)
+- [mpg123](https://www.mpg123.org/) (when MPEG decoding support is enabled with
+  `--enable-mpg123`)
+- [openaptx](https://github.com/Arkq/openaptx) (when apt-X support is enabled
+  with `--enable-aptx` and/or `--enable-aptx-hd`)
+- [spandsp](https://www.soft-switch.org) (when mSBC support is enabled with
+  `--enable-msbc`)
+
+Dependencies for client applications (e.g. `bluealsa-aplay` or `bluealsa-cli`):
+
+- [libdbus](https://www.freedesktop.org/wiki/Software/dbus/)
+
+Dependencies for `bluealsa-rfcomm` (when `--enable-rfcomm` is specified during
+configuration):
+
+- [readline](https://tiswww.case.edu/php/chet/readline/rltop.html)
+
+Dependencies for `hcitop` (when `--enable-hcitop` is specified during
+configuration):
+
+- [libbsd](https://libbsd.freedesktop.org/)
+- [ncurses](https://www.gnu.org/software/ncurses/)
+
+Once the desired options have been chosen, run:
+
+```sh
+mkdir build && cd build
+../configure [ OPTION ... ]
+```
+
+## Installation
+
+When the project is configured, compile and install it by running:
+
+```sh
+make
+sudo make install
+```
+
+When building from the git sources, if `git pull` is used to update the source
+tree, then it is recommended to refresh the build in order to update the
+version identifier embedded in the configure files. In the top-level directory
+run:
+
+```sh
+autoreconf --install --force
+```
+
+then in the build directory run `make clean` before running `make`.