Added readme.md from old codeplex landing page

README.md

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+# NCalc
+NCalc is a mathematical expressions evaluator in .NET. NCalc can parse any expression and evaluate the result, including static or dynamic parameters and custom functions.
+
+## Functionalities
+**Simple Expressions**
+
+```c#
+Expression e = new Expression("2 + 3 * 5");
+Debug.Assert(17 == e.Evaluate());
+```
+
+**Evaluates .NET data types**
+
+```c#
+Debug.Assert(123456 == new Expression("123456").Evaluate()); // integers
+Debug.Assert(new DateTime(2001, 01, 01) == new Expression("#01/01/2001#").Evaluate()); // date and times
+Debug.Assert(123.456 == new Expression("123.456").Evaluate()); // floating point numbers
+Debug.Assert(true == new Expression("true").Evaluate()); // booleans
+Debug.Assert("azerty" == new Expression("'azerty'").Evaluate()); // strings
+```
+
+**Handles mathematical functional from System.Math**
+
+```c#
+Debug.Assert(0 == new Expression("Sin(0)").Evaluate());
+Debug.Assert(2 == new Expression("Sqrt(4)").Evaluate());
+Debug.Assert(0 == new Expression("Tan(0)").Evaluate());
+```
+
+**Evaluates custom functions**
+
+```c#
+Expression e = new Expression("SecretOperation(3, 6)");
+e.EvaluateFunction += delegate(string name, FunctionArgs args)
+    {
+        if (name == "SecretOperation")
+            args.Result = (int)args.Parameters[0].Evaluate() + (int)args.Parameters[1].Evaluate();
+    };
+
+Debug.Assert(9 == e.Evaluate());
+```
+
+**Handles unicode characters**
+
+```c#
+Debug.Assert("経済協力開発機構" == new Expression("'経済協力開発機構'").Evaluate());
+Debug.Assert("Hello" == new Expression(@"'\u0048\u0065\u006C\u006C\u006F'").Evaluate());
+Debug.Assert("だ" == new Expression(@"'\u3060'").Evaluate());
+Debug.Assert("\u0100" == new Expression(@"'\u0100'").Evaluate());
+```
+
+**Define parameters, even dynamic or expressions**
+
+```c#
+Expression e = new Expression("Round(Pow([Pi], 2) + Pow([Pi2], 2) + [X], 2)");
+
+e.Parameters["Pi2"] = new Expression("Pi * [Pi]");
+e.Parameters["X"] = 10;
+
+e.EvaluateParameter += delegate(string name, ParameterArgs args)
+  {
+    if (name == "Pi")
+    args.Result = 3.14;
+  };
+
+Debug.Assert(117.07 == e.Evaluate());
+```