fist version of the lexer

docs/syntax_v1.md

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+#### Base syntax
+
+How to define a new concept
+
+
+    concept newFile:
+    
+        props:
+            name    
+    
+        pre:
+            import os
+            os.path.isfile(name) == False
+        
+            
+        post:
+            import os
+            os.path.isfile(name) == True
+        
+        main:
+            f = open(name)
+            f.close()
+            __context__.add(newFile, name, f)
+
+example
+
+    create a new file named MyFirstFile.txt => newFile("MyFirstFile.txt")
+
+
+
+concept newFile:
+
+    props:
+        name
+        path
+
+    pre:
+        import os
+        os.path.isfile(path) == False
+    
+        
+    post:
+        import os
+        os.path.isfile(path) == True
+    
+    main:
+        import os
+        f = open(name)
+        f.close()
+        sheeka.add(File(name, path))
+    
+
+concept open:
+    
+    pre:
+        self.is_opened == False
+        
+    post:
+        self.is_opened == True
+        
+    main:
+        self.open
+        
+        
+open the door => d = get_instance(door) && get_concept(open).call(d)
+        
+
+concept File:
+    
+    props:
+        name
+        path
+        
+     def open(): 
+     
+     
+     def close():
+
+open the file toto.txt => get_concept(open).call(File(path="toto.txt", name="toto.txt))
+
+concept is_the_opposite:
+    
+    props:
+        a, b
+        
+    test:
+        a.pre == not b.pre && a.post == b.post
+      
+
+print all concepts
+
+concepts
+print all
+
+concept print:
+    
+    main:
+        print(self)
+
+concept all:
+
+    main:
+        self.find_all()