examples: Add a comment in the examples/ folder for each example program explaining how to run it

[CatalinStratu]

Add a comment in the examples/ folder for each example program explaining how to run it.

It is desirable that these comments be added after Pull Request #114 is successfully accepted because the first comment of this kind was added in this PR.

Running examples are required for the following examples:

• examples/1-load
• examples/2-load-save
• examples/4-search
• examples/5-report
• examples/6-licensediff
• examples/7-rdfloader
• examples/8-jsontotv
• examples/9-tvtojson
• examples/10-jsonloader

It would be good if these examples were also put in the file examples/ README.md

[swinslow]

Fixed in #123, thank you @CatalinStratu!