find steps

README.md

 ## ENGINEERING JOURNAL
 ### Jingyan Ling
 
+### 08/11/2019
+- Finally figure out geometry algorithm on paper
+- Coding for parallel trace in following steps:
+  - 1. find start point and end point of a path, compute 4 points that vertical to end points based on width
+  - 2. find the angle bisector between each segment
+  - 3. Offset original path based on given width
+  - 4. find intersect between paths with offset and angle bisectors
+  - 5. connect intersect points and 4 end-points
+- 
 ### 08/09/2019
 
 - Potential problem: