Use HTTPS in URL for spdx.org

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>

This was linking to a non-existent page in the wiki.

Signed-off-by: Alex Tomlins <alex@tomlins.org.uk>

Signed-off-by: Ted Hess <thess@kitschensync.net>

Add description of preferred archive formats and download methods.
Encourage multiple maintainers.

Signed-off-by: Ted Hess <thess@kitschensync.net>

For consistency, use full name instead of $(PKG_NAME) in define and eval
lines for all packages.

I've seen reviews that asked to do this before, and I am asking the same
during reviews now. To avoid this in the future, fix this treewide so
when people use existing packages as example, we will not have to
request this change anymore.

This makes all packages consistent with both LEDE and OpenWrt base
repositories.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

Add "best practices" advice about working with pull requests.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

Signed-off-by: Ted Hess <thess@kitschensync.net>

Add guideline to avoid rolling sources.
Some minor cleanups and clarifications.

Per r33861, it should be PKG_LICENSE and PKG_LICENSE_FILES used for licensing information.

Signed-off-by: Ian Leonard <antonlacon@gmail.com>

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>

Signed-off-by: Steven Barth <steven@midlink.org>

Signed-off-by: Steven Barth <steven@midlink.org>

I found them too hard to understand ;)

Signed-off-by: Steven Barth <steven@midlink.org>

Signed-off-by: Steven Barth <steven@midlink.org>

Pass 3, add back SPDX and examples. Change copyright reqs.

Signed-off-by: Ted Hess <thess@kitschensync.net>

Signed-off-by: Steven Barth <cyrus@openwrt.org>

Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>

see https://github.com/blog/1184-contributing-guidelines

Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>