Added README.md

README.md

+# Gitlab-CI/Condor: Mandelbrot
+
+Black and white Mandelbrot in C.
+
+## Running locally
+In a local shell, run:
+```
+gcc mandelbrot.c
+```
+```
+./a.out
+```
+Now open the generated .ppm file!
+
+## Running with Gitlab-CI on a Local Gitlab Runner
+
+## Running with Gitlab-CI on a Condor Runner