Update README.md

README.md

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-# nim-extentions
+# nim-extensions
 Extensions for the nim programming language.
+
+These extensions aim to improve the usability of nim in practical applications.
+
+Extensions so far include:
+
+## OOP macro
+  usage: 
+  
+  ```nim
+  class BaseObject: # inherits from RootObj
+    # attributes/properties
+    var
+      x: int
+      y: float
+      
+    method override_me(argx: float): int=
+      result = int(argx) + self.x
+      
+  class ClassName of BaseObject:
+      method method_name(arg1: int, arg2: float=0.3): float=
+        ## do stuff here
+        result = arg2
+        
+      method override_me(argx: float): int=
+        result = int(self.y) + int(argx) + self.x
+  ```