Webapp development notes

[mwfarb]

• Adding notes on how to test webapp for development.
• Adding notes documenting webapp structure for maintenance.
• Adding notes on potential future development.

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This change is 

[mwfarb]

@mmalesev @juagargi Let me know if this will be enough for maintenance documentation.

[matzf]

Reviewable status: 0 of 2 files reviewed, 2 unresolved discussions (waiting on @mwfarb)

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webapp/development.md, line 52 at r2 (raw file):

## Future Features
* **Latency Tests**: *(in development)* SCION ping and traceroute results would be listed next to available paths or overlaid on path graphs allowing easy examination of performance.
* **Name Resolution**: Integration with the SCION name resolution service (RAINS), would optionally show full AS names rather than IA numbers.

Nitpick: RAINS resolves host names, not AS names.

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webapp/development.md, line 95 at r2 (raw file):

git clone -b scionlab https://github.com/netsec-ethz/scion-apps
cd scion-apps
mkdir ~/go/bin # needed for make bug

I don't think this is needed anymore; install does mkdir -p $(DESTDIR).

[matzf]

Thank you, @mwfarb!

Reviewed 1 of 2 files at r1, 1 of 1 files at r2.
Reviewable status: all files reviewed, 2 unresolved discussions (waiting on @mwfarb)

[matzf]

Reviewed 1 of 1 files at r3.
Reviewable status: complete! all files reviewed, all discussions resolved