gnucash-docs maint: Guide:C: Add a directory with datafiles for faster regeneration of images

[Frank H.Ellenberger]

Updated	 via  https://github.com/Gnucash/gnucash-docs/commit/438da7df (commit)
	from  https://github.com/Gnucash/gnucash-docs/commit/13fa2d9a (commit)



commit 438da7dfec20b62c4a66cdc36e129ab18e56bb38
Author: Frank H. Ellenberger <frank.h.ellenberger at gmail.com>
Date:   Wed Aug 4 16:55:54 2021 +0200

    Guide:C: Add a directory with datafiles for faster regeneration of
    images



Summary of changes:
 data/C/guide/currency_main1.gnucash | 352 +++++++++++++++++++++++++++++++
 data/C/guide/currency_main2.gnucash | 372 +++++++++++++++++++++++++++++++++
 data/C/guide/currency_main3.gnucash | 401 ++++++++++++++++++++++++++++++++++++
 data/README                         |  14 ++
 4 files changed, 1139 insertions(+)
 create mode 100644 data/C/guide/currency_main1.gnucash
 create mode 100644 data/C/guide/currency_main2.gnucash
 create mode 100644 data/C/guide/currency_main3.gnucash
 create mode 100644 data/README