[PATCH rtems-lwip] README: Add build instruction

[Vijay Kumar Banerjee]

I will push this patch. The main intention of this patch is to test
the new top-level repo, but it also provides some essential build
instructions which will certainly be handy.

On Thu, Jul 21, 2022 at 2:05 PM Vijay Kumar Banerjee <vijay at rtems.org> wrote:
>
> Hi Kinsey,
>
> thanks for the review
>
> On Thu, Jul 21, 2022 at 1:50 PM Kinsey Moore <kinsey.moore at oarcorp.com> wrote:
> >
> > Looks good to me. I never realized that the list of BSPs and tools
> > directory could be omitted if things were installed in particular locations.
> >
> Yes, it picks up all the installed BSPs if there is that option is not
> used. using the BSP argument only builds the mentioned bsps.
>
>
> Best regards,
> Vijay
> > On 7/21/2022 14:16, Vijay Kumar Banerjee wrote:
> > > ---
> > >   README | 18 ++++++++++++++++++
> > >   1 file changed, 18 insertions(+)
> > >
> > > diff --git a/README b/README
> > > index 91e42ae..99800bf 100644
> > > --- a/README
> > > +++ b/README
> > > @@ -12,3 +12,21 @@ The sources presented here originate in one of several locations described by
> > >   the ORIGIN.* files and whose license is described by the COPYING.* files.
> > >   Commits adding such files should include the hash of the target repository if
> > >   applicable.
> > > +
> > > +Installation Instructions
> > > +-------------------------
> > > +1. Populate the git submodules:
> > > +
> > > +```
> > > +git submodule init
> > > +git submodule update
> > > +```
> > > +2. Configure and build
> > > +```
> > > +./waf configure --prefix=INSTALL_PREFIX
> > > +./waf
> > > +./waf install
> > > +```
> > > +
> > > +More `waf` arguments can be found by using:
> > > +`./waf --help`
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