Provide Description section for sfdoc

src/saturnin.sh.skel

@@ -4,6 +4,63 @@ shellfu import exit
 shellfu import inigrep
 shellfu import pretty
 
+#
+# Saturnin - __MKIT_PROJ_TAGLINE__
+#
+# Saturnin is a Shellfu module that can help you build consistent and easy
+# to use command line-based toolkit.  The idea is that you have a set of
+# scripts that together form a particular tool, which you then integrate
+# under a single meta-command (similar to git, apt, systemctl and many
+# others...).
+#
+# Saturnin's main goal is to help you with the integration so that you can
+# fully concentrate on development of the scripts, while Saturnin will
+# provide the common part of command-line interface.  Adding to that,
+# Saturnin also provides several extra features as config management,
+# hooks or support for command line completion.
+#
+# It's possible to integrate any kind of programs within Saturnin, although
+# extra features are currently only available for Shellfu/Bash scripts.
+#
+# Starting your toolkit
+# =====================
+#
+# The starting point of a Saturnin-powered toolkit is the main meta-command,
+# which sets all mandatory variables and calls saturnin__main().  You could
+# implement that one yourself, but it's **strongly recommended** to start
+# off by creating a copy of 'app.skel' from 'saturnin-demo':
+#
+#     https://github.com/AloisMahdal/saturnin-demo/
+#
+# In fact, it's best to actually copy the *whole* project, which serves
+# as skeleton of not just the meta-command (by Saturnin) but also MKit
+# install/build system, which provides features like installation
+# scripts, SemVer-compatible versioning and packaging templates for both
+# RPM and DEB:
+#
+#     git clone https://github.com/AloisMahdal/saturnin-demo
+#     mv saturnin-demo myproject
+#     cd myproject
+#     rm -rf .git
+#     git init
+#
+# You will need to edit few files, for starters:
+#
+#     edit mkit.ini                     # your main project info
+#     edit packaging/template.spec      # file lists, Requires and description
+#     edit packaging/debian/control     # ..also for Debian
+#     git add .
+#     git commit -m "Initial commit"
+#
+# ...but the reward is sweet:
+#
+#     make install      # to install to current system
+#
+#     make rpmstuff     # to get .spec file and source tarball
+#     make debstuff     # to get debian directory
+#     make vbump        # to seal off release
+#     make release      # to seal off release
+#
 
 #
 # Git commit hash of application source tree