Add changelog

CHANGELOG

+# Change Log
+All notable changes to this project will be documented in this file.
+
+## [unreleased]
+
+### Added
+- show name and id of rooms/subrooms in "geometry structure"
+- Rename directory to `JPSvis_Files`: 94ed0a55
+
+##v0.8.0 [2016-02-18]
+### Added
+- option to load  vtk files. Need to add the line ``` <gradient_field filename="floorfield.vtk"> 
+``` in the header of the trajectory file. Alternatively drag and drop a vtk file on JPSvis.
+ 
+### Fixed 
+- Error displaying the total number of frames when using the scroolbar
+
+## v0.7.0 [2015-07-15]
+### Added
+- Display the geometry structure individual room/subroom.
+- Now build on OSX/Linux/Windows 
+
+### Fixed
+- Visiblity in 3D
+- Numerous geometrical operations
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