minor commit (#11)

* Add todo

* add gitignore

Author: astomodynamics

.gitignore

@@ -0,0 +1,2 @@
+# 
+build/

src/cddp_core/CDDPProblem.cpp

@@ -6,15 +6,18 @@
 #include "cddp_core/CDDPProblem.hpp" 
 #include "osqp++.h"
 /* 
-TODO
+TODO:
 - Add circle constraint
+- Add ellipse constraint
 - Add Merit function check
 - Add regularization
-- Add trust region
+- Add trust region/line-search
 - Add print methods
 - Add convergence check
 - Add cost improvement check
 - Add expected improvement check
+- Add parallelization
+- Add warm start
 */
 
 namespace cddp {