electrum: move INSTALL.msg to README.voidlinux

srcpkgs/electrum/template

@@ -1,7 +1,7 @@
 # Template file for 'electrum'
 pkgname=electrum
 version=4.2.0
-revision=1
+revision=2
 build_style=python3-module
 hostmakedepends="python3-setuptools python3-PyQt5-devel-tools"
 depends="python3-aiohttp python3-aiohttp_socks python3-aiorpcx
@@ -27,4 +27,5 @@ post_install() {
 		-e 's|testnet %u|testnet|' \
 		${DESTDIR}/usr/share/applications/electrum.desktop
 	vlicense LICENCE
+	vdoc "${FILESDIR}/README.voidlinux"
 }