Adding documentation for ACM/VBA workaround

[Ryan-Hughes-8]

Fixes/Addresses:

#1076 and #1044

Summary/Motivation:

Adding documentation for a workaround for connecting complicated ACM models to FOQUS.

Legal Acknowledgement

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1. I agree my contributions are submitted under the copyright and license terms described in the LICENSE.md file at the top level of this directory.
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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (36d213b) 34.76% compared to head (6edacb6) 34.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1118   +/-   ##
=======================================
  Coverage   34.76%   34.76%           
=======================================
  Files         161      161           
  Lines       36296    36296           
  Branches     5940     5940           
=======================================
  Hits        12618    12618           
  Misses      22696    22696           
  Partials      982      982           

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[ksbeattie]

LGTM