R: maap-py data access with CMR & maap-py job management

[grallewellyn]

Create user facing documentation on common usage of:

• maap-py data access with CMR
• maap-py job management

[rtapella]

This issue is a continuation of
MAAP-Project/Community#684

[grallewellyn]

Importing maap-py in R:

library(reticulate)
maap <- import("maap.maap")
maap_obj <- maap$MAAP(maap_host='api.maap-project.org')

result <- maap_obj$getJob('04f149fb-2ce6-44c4-aa0b-e15b35e1ee6d')

result