add install target in OSX Makefile for homebrew formula

Makefile.osx

@@ -31,6 +31,14 @@ endif
 
 # Disabled, since it will be the default make rule. I think its better
 # to define the default rule in Makefile and not Makefile.<ostype> - torkel
-#install: all
-#	test -d ${PREFIX} || mkdir -p ${PREFIX}/
-#	cp -r i2p ${PREFIX}/
+install-brew: all
+	install -d ${PREFIX}/bin ${PREFIX}/etc/i2pd ${PREFIX}/share/doc/i2pd ${PREFIX}/share/i2pd ${PREFIX}/share/man/man1 ${PREFIX}/var/lib/i2pd
+	install -m 755 ${I2PD} ${PREFIX}/bin/
+	install -m 644 contrib/i2pd.conf contrib/subscriptions.txt contrib/tunnels.conf ${PREFIX}/etc/i2pd
+	@cp -R contrib/certificates ${PREFIX}/share/i2pd/
+	install -m 644 ChangeLog LICENSE README.md contrib/i2pd.conf contrib/subscriptions.txt contrib/tunnels.conf ${PREFIX}/share/doc/i2pd
+	@gzip debian/i2pd.1 && install debian/i2pd.1.gz ${PREFIX}/share/man/man1
+	@ln -sf ${PREFIX}/share/i2pd/certificates ${PREFIX}/var/lib/i2pd/
+	@ln -sf ${PREFIX}/etc/i2pd/i2pd.conf ${PREFIX}/var/lib/i2pd/i2pd.conf
+	@ln -sf ${PREFIX}/etc/i2pd/subscriptions.txt ${PREFIX}/var/lib/i2pd/subscriptions.txt
+	@ln -sf ${PREFIX}/etc/i2pd/tunnels.conf ${PREFIX}/var/lib/i2pd/tunnels.conf