Added DefaultParser

docs/syntax_v2.md

@@ -17,4 +17,23 @@ def concept a is a number as :
 
 --> adds concept a is a number
 --> add the pre condition to the concept a plus b
+```
+
+# Define a new concept in one line
+```
+def concept words
+def concept words [where whereclause] [as expression] [pre precond] [post postcond]
+```
+
+# Define a complicated concept
+```
+def concept 
+as:
+    ...
+where:
+    ...
+pre:
+    ...
+post:
+    ...
 ```