Update README to produce initial evmctl.1 man page

Update README with additional information to produce initial
evmctl.1 man page. Sligtly reformat it for that purpose as well.

Requires asciidoc, xslproc, docbook-xsl packages to build man page.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>

Makefile.am

@@ -1,8 +1,12 @@
 SUBDIRS = src
+# does work on Ubuntu, but on Fedora different path to XSL stylesheets
+#man_MANS = evmctl.1
 
 doc_DATA =  examples/ima-genkey-self.sh examples/ima-genkey.sh examples/ima-gen-local-ca.sh
 EXTRA_DIST = autogen.sh $(doc_DATA)
 
+CLEANFILES = *.html *.1 *.xsl
+
 ACLOCAL_AMFLAGS = -I m4
 
 SRCS = $(HOME)/rpmbuild/SOURCES
@@ -20,4 +24,18 @@ rpm: $(tarname)
 	cp $(tarname) $(SRCS)/
 	rpmbuild -ba --nodeps $(SPEC)
 
+# requires asciidoc, xslproc, docbook-xsl
+MANPAGE_DOCBOOK_XSL = /usr/share/xml/docbook/stylesheet/docbook-xsl/manpages/docbook.xsl
+
+evmctl.1.html: README
+	@asciidoc -o $@ $<
+
+evmctl.1.xsl: README
+	@asciidoc -d manpage -b docbook -o $@ $<
+
+evmctl.1: evmctl.1.xsl
+	@xsltproc --nonet -o $@ $(MANPAGE_DOCBOOK_XSL) $<
+
+doc: evmctl.1.html evmctl.1
+
 .PHONY: $(tarname)