add python wrapper developer notes

[RafalSkolasinski]

What this PR does / why we need it:

Document how to run Seldon Core Wrapper for local development without docker.

Which issue(s) this PR fixes:

Fixes #2722

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[seldondev]

Thu Dec 3 11:42:22 UTC 2020
The logs for [lint] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2738/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2738 --build=2

[seldondev]

Thu Dec 3 11:42:31 UTC 2020
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2738/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2738 --build=1

[seldondev]

Thu Dec 3 12:00:17 UTC 2020
The logs for [lint] [4] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2738/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2738 --build=4

[seldondev]

Thu Dec 3 12:00:22 UTC 2020
The logs for [pr-build] [3] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2738/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2738 --build=3

[axsaucedo]

Nice
/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

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[narennadig]

Thanks :)