Initial commit:

Added framework to generate DOT and png files of character map chart
from data folder.
Added all figures in the 1-2 chapters.
Added font file SimSum for render chart

data/character/沙僧.yaml

@@ -0,0 +1,15 @@
+schema: v1
+type: character
+details:
+  name: 沙僧
+  other_names:
+  - 沙悟净
+  - 沙和尚
+  relationships:
+  - source: 沙僧
+    destination: 唐僧
+    description: 师徒
+    bidirection: true
+  description: 
+  links:
+  - https://zh.wikipedia.org/wiki/%E6%B2%99%E5%83%A7