add basic model saving and loading functionality

Author: bmtgoncalves

.gitignore

@@ -1,3 +1,7 @@
+*.bak
+.DS_Store
+*.png
+*.csv
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]

models/SIR.yaml

@@ -0,0 +1,12 @@
+# Epidemic Model with 3 compartments and 2 transitions:
+
+Parameters:
+  beta : 0.200000
+  mu : 0.100000
+
+
+Transitions:
+  - S + I = I beta
+  - I -> R mu
+
+# R0=2.00