Add option to speed up local tests (Open-Acidification#69)

* Copy files to add speedup code.
* Add README.md describing why this was added and when it should be removed.

Author: James Foster

.github/actions/spelling/excludes.txt

@@ -12,3 +12,4 @@ LICENSE
 .all-contributorsrc
 .gitignore
 Makefile
+^other/*

.gitignore

@@ -29,5 +29,7 @@ Gemfile.lock
 vendor/*
 *.cpp.bin*
 
+*libarduino*
+
 # Doxygen Generated Files
 public

other/README.md

@@ -0,0 +1,3 @@
+A [change](https://github.com/Arduino-CI/arduino_ci/pull/294) to arduino_ci gives us almost a 20x speed improvement. While we are waiting for that fix, we have the option of copying in the appropriate files and installing them in our own copy of the gem. Running `install.sh` does this.
+
+See [this](https://github.com/Open-Acidification/TankController/issues/71) for a removal reminder.