Updating README file

Grouping api route together
Adding message when labs is not available

Merge branch '18-get_datafiles_list-should-return-empty-dataframe-if-no-file-was-found' into 'master'

return empty df if no file found

Closes #18

See merge request !16

Resolve "Allow to keep file content in memory"

Closes #15

See merge request !11

# Conflicts:
#   pyiricdata/Client.py

Resolve "Retrieve a file metadata searching by filename"

Closes #14

See merge request !15

# Conflicts:
#   pyiricdata/Client.py

Resolve "Variable name consistency"

Closes #16

See merge request !13

Resolve "Do not exit python if connection fails"

Closes #13

See merge request !12

Conflicts:
	pyiricdata/Client.py

Conflicts:
	pyiricdata/Client.py

Conflicts:
	pyiricdata/Client.py

fix comment of get_datafiles_list.