Created Value conversion (markdown)

Value-conversion.md

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+## Value conversion between C# and S7 plc
+
+* Read S7 Word:
+```
+ushort result = (ushort)plc.Read("DB1.DBW0");
+```
+
+* Write S7 Word:
+```
+ushort val = 40000;
+plc.Write("DB1.DBW0", val);
+```
+
+* Read S7 Int / Dec, you need to use the method ConvertToShort():
+```
+short result = ((ushort)plc.Read("DB1.DBW0")).ConvertToShort();
+```
+* Write S7 Int / Dec, you need to use the method ConvertToUshort():
+```
+short value = -100;
+plc.Write("DB1.DBW0", value.ConvertToUshort());
+```
+
+* Read S7 DWord:
+```
+uint result = (uint)plc.Read("DB1.DBD40");
+```
+* Write S7 DWord:
+```
+uint val = 1000;
+plc.Write("DB1.DBD40", val);
+```
+
+* Read S7 Dint, you need to use ConvertToInt():
+```
+int result2 = ((uint)plc.Read("DB1.DBD60")).ConvertToInt();
+```
+
+* Write S7 Dint:
+```
+int value = -60000;
+plc.Write("DB1.DBD60", value);
+```
+* Read S7 Real, you need to use ConvertToDouble():
+```
+double result = ((uint)plc.Read("DB1.DBD40")).ConvertToDouble();
+```
+
+* Write S7 Real, you need to use ConvertToInt():
+```
+double val = 35.687;
+plc.Write("DB1.DBD40", val.ConvertToUInt());
+```
+
+* Read bool from byte
+```
+byte myByte = 5; // 0000 0101
+myByte.SelectBit(0) // true
+myByte.SelectBit(1) // false
+```