Add dir and ino file for temp controllers.

Included basic working example to setup ethernet
and get an IP address using DHCP.

temp_controller/README.md

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+# Temperature Control
+
+Enables basic thermostat control for fermentation, kegerator, etc.
+
+## Requirements
+Arduino Nano (clone) with ethernet shield.
+
+For programing the board:
+  - Board : Arduino Nano
+  - Processor : ATmega328P
+  - Port : /dev/ttyUSB0
+
+This board/shield combo works with the [EthernetENC](https://github.com/jandrassy/EthernetENC/wiki) library.

temp_controller/temp_controller.ino

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+/* Built-in */
+#include <SPI.h>
+
+/* Extra Libraries */
+#include <EthernetENC.h>
+
+byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
+IPAddress ip(192, 168, 1, 177);
+IPAddress myDns(192, 168, 1, 1);
+
+// Initialize the Ethernet client library
+// with the IP address and port of the server
+// that you want to connect to (port 80 is default for HTTP):
+EthernetClient client;
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+
+  // start the Ethernet connection:
+  Serial.println("Initialize Ethernet with DHCP:");
+  if (Ethernet.begin(mac) == 0) {
+    Serial.println("Failed to configure Ethernet using DHCP");
+    // Check for Ethernet hardware present
+    if (Ethernet.hardwareStatus() == EthernetNoHardware) {
+      Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
+      while (true) {
+        delay(1); // do nothing, no point running without Ethernet hardware
+      }
+    }
+    if (Ethernet.linkStatus() == LinkOFF) {
+      Serial.println("Ethernet cable is not connected.");
+    }
+    // try to congifure using IP address instead of DHCP:
+    Ethernet.begin(mac, ip, myDns);
+  } else {
+    Serial.print("  DHCP assigned IP ");
+    Serial.println(Ethernet.localIP());
+  }
+}
+
+void loop() {
+}