Create Changelog.md

Author: raulmur

Changelog.md

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+#Changelog of ORB-SLAM Monocular
+
+## 1.0.1 (18-01-2016)
+- Save/load vocabulary from text file instead of cv::FileStorage. 
+- Unused files from Thirdparty/DBoW2 and Thirdparty/g2o have been removed. g2o files have been reorganized and we compile only
+one library libg2o.so instead of four libraries (libg2o_core.so, libg2o_types.so, etc)
+- We use now Eigen solver instead of Cholmod solver in g2o. Removed dependency on Suitesparse and Cholmod.
+- Several bugs have been fixed.
+
+## 1.0.0 (03-03-2015)
+First ORB-SLAM Monocular version