Add tutorials for TauP

[core-man]

Try to move and update TauP in https://blog.seisman.info/tags/TauP/

• [x] Introduction：https://blog.seisman.info/taup/
• [x] Install
• [x] Calculate arrival time and ray parameter：https://blog.seisman.info/taup-calculate-traveltime/
• [ ] Identify multiple P phase：https://blog.seisman.info/taup-identify-multiple-P-phases/
• [ ] Calculate travel time of underside reflections：https://blog.seisman.info/taup-calculate-underside-reflection-traveltime/
• [ ] Calculte pierce points (taup_pierce)：https://blog.seisman.info/taup-calculate-pierce-points/
• [x] Set predicted arrival time for SAC files (taup_setsac)：https://blog.seisman.info/taup-mark-traveltime/
• [ ] TauP cutom models：https://blog.seisman.info/taup-custom-models/
• [ ] TauP phase naming rules：https://docs.obspy.org/packages/obspy.taup.html#phase-naming-in-obspy-taup
• [ ] Calculate first P arrivals

Commands (Let's put taup tools in this order?):

• [ ] taup
• [x] taup_time
• [x] taup_curve
• [x] taup_table
• [x] taup_path
• [ ] taup_pierce
• [x] taup_wavefront (#214)
• [x] taup_setsac
• [ ] taup_create

See also seismo-learn/maintenance#12

[seisman]

We may also need a section explaining the phase naming rules in TauP, but before that, we may also need a section explaining the standard phase naming conventions in "seismology".

[core-man]

Yes, do you think it is good to be included in seismolog101 or seismology? An example:

https://migg-ntu.github.io/SeisTomo_Tutorials/seismology/seismic-wave/seismic-phases.html

[seisman]

I think we should include http://www.isc.ac.uk/standards/phases/ into "seismology", but I don't want to include all the phases, as some phases are rarely seen and used.

We also need a short section in "seismology101", but after we finish "seismology".

[core-man]

A list of Philips' codes http://www.seis.sc.edu/downloads/

There are some taup preleases that are newer than the official version.

[seisman]

Need to wait for the official release.

[core-man]

See https://github.com/seismo-learn/software/issues/182#issuecomment-828142469. We have four new commands for TauP 2.5.0.

• [x] velplot (#209)
• [x] slowplot (#210)
• [ ] velmerge
• [ ] phase