docs: Convert 'php' page to rST

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>

docs/php.rst

@@ -0,0 +1,23 @@
+================
+PHP API bindings
+================
+
+The libvirt-php, originally called php-libvirt, is the PHP API bindings for the
+libvirt virtualization toolkit originally developed by Radek Hladik.
+
+Getting the source
+------------------
+
+The PHP bindings code source is now maintained in a
+`git <https://git-scm.com/>`__ repository available on
+`gitlab.com <https://gitlab.com/libvirt/libvirt-php>`__:
+
+::
+
+   git clone https://gitlab.com/libvirt/libvirt-php.git
+
+Project pages
+-------------
+
+Since February 2011 the project has its own pages hosted at libvirt.org. For
+more information on the project please refer to https://libvirt.org/php.