Ajout de calculator

not-alone-core/src/main/thrift/calculator.thrift

+namespace cpp com.example.calculator
+namespace d com.example.calculator
+namespace java com.example.calculator
+namespace php com.example.calculator
+namespace perl com.example.calculator
+namespace as3 com.example.calculator
+
+enum TOperation {
+    ADD = 1,
+    SUBSTRACT = 2,
+    MULTIPLY = 3,
+    DIVIDE = 4
+}
+
+exception TDivisionByZeroException {
+}
+
+service TCalculatorService {
+    i32 calculate(1:i32 num1, 2:i32 num2, 3:TOperation op) throws (1:TDivisionByZeroException divisionByZero);
+}
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