epm play: add webcord (#44)

play.d/webcord.sh

+#!/bin/sh
+
+PKGNAME=WebCord
+SUPPORTEDARCHES="x86_64"
+VERSION="$2"
+DESCRIPTION="A Discord and Spacebar client implemented directly without Discord API from the official github"
+
+. $(dirname $0)/common.sh
+
+pkgtype=AppImage
+
+PKGURL=$(epm tool eget --list --latest https://github.com/SpacingBat3/WebCord/releases "WebCord-$VERSION-x64.$pkgtype")
+[ -n "$PKGURL" ] || fatal "Can't get package URL"
+
+epm install "$PKGURL"