https-dns-proxy: re-add conffiles and add description to Makefile

Signed-off-by: Stan Grishin <stangri@melmac.net>

net/https-dns-proxy/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=https-dns-proxy
 PKG_VERSION:=2020-04-09
-PKG_RELEASE=2
+PKG_RELEASE=3
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/aarond10/https_dns_proxy
@@ -26,6 +26,15 @@ define Package/https-dns-proxy
 	CONFLICTS:=https_dns_proxy
 endef
 
+define Package/https-dns-proxy/description
+https_dns_proxy is a light-weight DNS<-->HTTPS, non-caching translation proxy for the RFC 8484 DNS-over-HTTPS standard. It receives regular (UDP) DNS requests and issues them via DoH.
+Please see https://github.com/openwrt/packages/blob/master/net/https-dns-proxy/files/README.md for further information.
+endef
+
+define Package/https-dns-proxy/conffiles
+/etc/config/https-dns-proxy
+endef
+
 define Package/https-dns-proxy/install
 	$(INSTALL_DIR) $(1)/usr/sbin $(1)/etc/init.d ${1}/etc/config
 	$(INSTALL_BIN) $(PKG_BUILD_DIR)/https_dns_proxy $(1)/usr/sbin/https-dns-proxy