Added C99 Solution

c99/README.md

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+# Gilded Rose, C99 Edition
+
+The command "make" will build and run your tests, as well as build the program
+golden_rose, which can serve as the basis for a golden-rule test.
+
+
+## Assumptions
+  - gnu make and a C compiler (like gcc) is installed on your system and is in the PATH
+  - The check unit testing library is installed on your system (https://libcheck.github.io/check/)
+  - pkg-config is installed on your system
+
+## Usage
+  - Run `make` to build the program and run all tests
+  - Files which contain tests should be named `test_*.c`  They will automatically
+    be included in your test suite.
+  - `GildedRose.h` should not be modified.  The Goblin threat is real.
+  - New program logic may be included in files named `gilded_*.c` which will
+    automatically be included in both your tests and the final program.
+
+## Golden Rule tests
+  - The program `golden_rose` will generate text output.  If you capture this
+    output after your first `make` you can use this as a reference for a golden
+    rule test.
+  - You can test your work against this reference by directing the output of your
+    current golden_rose to a file and using the `diff` utility to compare that
+    to the reference file you created above.
+  - To avoid the Goblin threat you can use `git diff GildedRose.h`, which should
+    have no output if you have left the precious Item structure unchanged.
+
+## Notes
+  - This project is tweaked to run on Linux systems, and will mostly work on Macs.
+    With some changes to the Makefile it can be made to run on BSD systems with
+    BSD make.  An adventurous person could also get it to run on Windows.
+  - If you are working on a Macintosh computer you cannot run the memtest target,
+    because valgrind and OS X don't play nice any more.  If you want to use the
+    memory checker OS X does run docker as a first class citizen.
+  - If you don't have pkg-config on your system, the only changes you'll need to
+    make are for the requirements of the check library.  Mostly you need to
+    set the appropriate flags for threaded binaries, which may include some
+    special linker flags.  The libcheck documentation will cover what you need
+    if you want to undertake this change.