Add docs (draft)

94e74233 · Zhen Zhang · d0830956 · 94e74233 · 94e74233 · a27dae57
Commit 94e74233 authored Oct 13, 2016 by Zhen Zhang
--- a/notes/flat.md
+++ b/notes/flat.md
--- a/notes/st.png
+++ b/notes/st.png
--- a/tex @ a27dae57
+++ b/tex @ a27dae57
+Subproject commit a27dae5770695b96d3d260bf923a3bbdb1d2ee49