Adds readme and configures Modbus RTU

LevelSensor/Controller/Controller/MbSrvConf.xml

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+<modbusServer Version="2.0">
+  <modbusRegister name="COILS">
+    <mapping variable="alarm_Hi" parent="Micro820" dataType="Bool" address="000001">
+      <MBVarInfo ElemType="Bool" SubElemType="Any" DataTypeSize="1" />
+    </mapping>
+    <mapping variable="alarm_Lo" parent="Micro820" dataType="Bool" address="000002">
+      <MBVarInfo ElemType="Bool" SubElemType="Any" DataTypeSize="1" />
+    </mapping>
+  </modbusRegister>
+  <modbusRegister name="HOLDING_REGISTERS">
+    <mapping variable="val_Level" parent="Micro820" dataType="Real" address="40001">
+      <MBVarInfo ElemType="Real" SubElemType="Any" DataTypeSize="4" />
+    </mapping>
+    <mapping variable="cfg_LowAlarm" parent="Micro820" dataType="Real" address="40003">
+      <MBVarInfo ElemType="Real" SubElemType="Any" DataTypeSize="4" />
+    </mapping>
+    <mapping variable="cfg_HighAlarm" parent="Micro820" dataType="Real" address="40005">
+      <MBVarInfo ElemType="Real" SubElemType="Any" DataTypeSize="4" />
+    </mapping>
+  </modbusRegister>
+</modbusServer>

README.md

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+# Pioneer Level Sensor
+
+A platform for monitoring Pond Levels
+
+## Configuration
+
+### Default Ethernet Setings
+
+-   IP Address: 192.168.1.81
+-   Subnet Mask: 255.255.255.0
+-   Gateway: 192.168.1.1
+
+### Sensor Configuration
+
+The default configuration scales the level output to 34.6 Ft (10 m). In order to scale the level output to 16.4042 Ft (5 m), provide an input signal on Digital Input 1.
+
+## Ouputs
+
+The system provides 1 output.
+
+| Channel | Description             |
+| ------- | ----------------------- |
+| 0       | Alarm Output (Hi or Lo) |
+
+## Modbus Mapping
+
+The serial port (D+ / D-) is configured to communicate over Modbus RTU with the following parameters:
+
+-   Baud Rate: 19200
+-   Parity: None
+-   Data Bits: 8
+-   Stop Bits: 1
+
+### Coils
+
+| Coil # | Tag      | Description          |
+| ------ | -------- | -------------------- |
+| 1      | alarm_Hi | High Alarm is Active |
+| 2      | alarm_Lo | Low Alarm is Active  |
+
+### Holding Registers
+
+| Register # | Tag           | Description             |
+| ---------- | ------------- | ----------------------- |
+| 1 - 2      | val_Level     | Level measurement in Ft |
+| 3 - 4      | cfg_LowAlarm  | Low Alarm Limit in Ft   |
+| 5 - 6      | cfg_HighAlarm | High Alarm Limit in Ft  |
+
+## Contributors
+
+-   [Patrick McDonagh](https://github.com/patrickjmcd) - Owner