Updated readme with usage and description

README.md

@@ -1,4 +1,68 @@
 # einheit
-Nim unit testing library inspired by Python's unit tests.
+Nim unit testing library inspired by Python's unit tests. Nim's unittest library is good, but I wanted something a little more "Nim" feeling. I also really like Python's unittest module and thought it would be nice to have something similar in Nim. Also, unittest doesn't have much documentation on how to use it, and it's pretty bare bones, so I wanted a little more functionality and documentation.
+
+The benefit of the macro style I chose means that you can document your tests nicely as well :)
+
+### Description
+Compile-time macro that allows a user to easily define tests and run them.
+
+Methods are used for inheritance, so if you want to derive a test
+suite, then you have to make sure the base suite uses methods
+for the tests that you want to derive.
+
+If you don't want inheritance, you can just use procs.
+
+A special proc/method is called setup(). The macro will inject
+this if it doesn't exist and it will be called before running
+the test suite.
+
+Test methods/procs to be run are prefixed with "test" in the
+method/proc name. This is so that you can write tests that call
+procs that do other things and won't be run as a test.
+
+For each suite method/proc, an implicit variable called "self"
+is added. This lets you access the test_suite in an OO kind
+of way.
 
 
+### Usage
+
+```nim
+test_suite SuiteName of TestSuite:
+
+  var
+    suite_var: string
+    test_obj: int
+
+  method setup()=
+    ## do setup code here
+    self.suite_var = "Testing"
+    self.test_obj = 90
+
+  method test_adding_string()=
+    ## adds a string to the suite_var
+    self.suite_var &= " 123"
+    self.assert_equal(self.suite_var, "Testing 123")
+
+  proc raises_os()=
+    # This proc won't be invoked as a test, it must begin with "test" in lowercase
+    raise newException(OSError, "Oh no! OS malfunction!")
+  
+  method test_raises()=
+    # Two ways of asserting
+    self.assert_raises OSError:
+      self.raises_os()
+
+    self.assert_raises(OSError, self.raises_os())
+
+  method test_test_obj()=
+    self.assert_true(self.test_obj == 90)
+
+  method test_more_more()=
+    self.assert_false("String" != "String")
+
+  when isMainModule:
+    einheit.run_tests()
+```
+
+You can also find examples in the [test.nim](test.nim) file, including inheritance .