[Update] devel/arduino-esp8266

Hello,

Henning pointed out that he'd exprect to see a bit of guidance on how to
use the arduino-esp* stuff.

The following adds a bit of guidance to the package description file. A
pkg-readme seemed a bit heavy. Is this sufficient guidance, or ok?

--

Tracey Emery

Index: Makefile
===================================================================
RCS file: /cvs/ports/devel/arduino-esp8266/Makefile,v
retrieving revision 1.5
diff -u -p -u -r1.5 Makefile
--- Makefile 22 Aug 2020 19:15:24 -0000 1.5
+++ Makefile 1 Dec 2020 16:03:16 -0000
@@ -4,6 +4,7 @@ COMMENT = esp8266 arduino core toolset
V = 2.7.4
DISTNAME = esp8266-${V}
PKGNAME = arduino-${DISTNAME}
+REVISION = 0

CATEGORIES = devel

Index: pkg/DESCR
===================================================================
RCS file: /cvs/ports/devel/arduino-esp8266/pkg/DESCR,v
retrieving revision 1.1.1.1
diff -u -p -u -r1.1.1.1 DESCR
--- pkg/DESCR 23 Apr 2020 14:28:54 -0000 1.1.1.1
+++ pkg/DESCR 1 Dec 2020 16:03:16 -0000
@@ -1 +1,6 @@
Framework to program Espressif ESP8266 chipsets via the Arduino environment.
+
+Before using this arduino-core, the makeesparduino package must be installed
+to compile your sketches.
+
+If you haven't already, please use pkg_add to install makeesparduino.