org: add instructions for install RPM packages

* doc/org/install.org: Here.
* NEWS: Mention that we have RPM packages.

NEWS

@@ -46,6 +46,9 @@ New in spot 2.5.3.dev  (not yet released)
     is still 32, but this limit is no longer hardcoded.  Larger values
     will cost additional memory and time.
 
+  - We know distribute RPM packages for Fedora 28.  See
+    file:///home/adl/git/spot/doc/userdoc/install.html#Fedora
+
   Library:
 
   - The PSL/LTL simplification routine learned the following:
@@ -257,7 +260,7 @@ New in spot 2.5.3.dev  (not yet released)
   - Converting generalized-co-Büchi to Streett using dnf_to_nca()
     could produce bogus automata if the input had rejecting SCCs.
 
-  Deprecation notice:
+  Deprecation notices:
 
   - The type spot::acc_cond::mark_t has been overhauled and uses
     a custom bit-vector to represent acceptance sets instead of

doc/org/install.org

@@ -5,6 +5,9 @@
 #+HTML_LINK_UP: index.html
 
 * Installing from a tarball
+   :PROPERTIES:
+   :CUSTOM_ID: tar
+   :END:
 
 The latest release of Spot is version {{{LASTRELEASE}}}:
 
@@ -52,6 +55,9 @@ explanations about the various options you can use during this
 process.
 
 * Installing the Debian packages
+   :PROPERTIES:
+   :CUSTOM_ID: Debian
+   :END:
 
 We build Debian packages for amd64 and i386, for both releases and the
 development versions.  Packages for releases are built for Debian
@@ -90,7 +96,42 @@ examples).  The packages containing the libraries (=libspot0=,
 =libbddx0=, =libspotltsmin0=) are automatically installed as
 dependencies of the previous packages.
 
+* Installing the Fedora packages
+   :PROPERTIES:
+   :CUSTOM_ID: Fedora
+   :END:
+
+We build Fedora packages for amd64, for both releases and the
+development versions.  Both builds are currently made for Fedora 28.
+
+Our `stable` repository contains RPM for released versions of Spot, add it with:
+#+BEGIN_SRC sh
+sudo dnf config-manager --add-repo https://www.lrde.epita.fr/repo/fedora/lrde.repo
+#+END_SRC
+
+Our `unstable` repository contains RPM for the development versions of Spot,
+you can opt to use that instead:
+
+#+BEGIN_SRC sh
+sudo dnf config-manager --add-repo https://www.lrde.epita.fr/repo/fedora/lrde.repo
+sudo dnf config-manager --set-enabled lrde-unstable
+sudo dnf config-manager --set-disabled lrde-stable
+#+END_SRC
+
+Once the repository is set up, you can simply install Spot with:
+#+BEGIN_SRC sh
+sudo dnf install spot python3-spot spot-devel spot-doc
+#+END_SRC
+or a subset of those packages.  The package =spot= contains the
+command-line tools, =python3-spot= contains the Python bindinges,
+=spot-devel= contains the C++ header files, and =spot-doc= the
+documentation that you can also find online.  Those packages depends
+on =libspot= that contains the shared libraries.
+
 * Installing from git
+   :PROPERTIES:
+   :CUSTOM_ID: git
+   :END:
 
 The =master= branch of the git repository contains the code for the
 latest released version, possibly with a few yet-to-be-released