Explain how to build the documentation in the README.

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-See readme.txt in directory doc/en/txt/
- or readme.html in directory doc/en/HTML/.
\ No newline at end of file

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+See http://fcron.free.fr/ and http://fcron.free.fr/doc/en/.
+
+Alternatively, if you downloaded fcron as a tarball, see:
+* readme.txt in directory doc/en/txt/
+* or readme.html in directory doc/en/HTML/.
+
+If you cloned the git repo, you first need to build the documentation.
+On a Debian based system:
+```
+$ sudo apt install -y docbook docbook-xsl docbook-xml docbook-utils manpages-dev
+$ autoconf
+$ ./configure  # optionally, use: --without-sendmail
+$ make updatedoc
+```