Field & Web componnent (#13)

* add LICENSE (AGPL 3.0)

* add Web part

* Field (#12)

* ModbusAccessor finished and checked

* read and write Field done. pushToField to do

* field not finished, connection works

* read csv file and add some comments

---------

Co-authored-by: Nils Ritler <79571155+Slisls@users.noreply.github.com>

src/main/java/ch/hevs/isi/field/PollTask.java

@@ -0,0 +1,10 @@
+package ch.hevs.isi.field;
+
+import java.util.TimerTask;
+
+public class PollTask extends TimerTask {
+    @Override
+    public void run() {
+        ModbusRegister.poll();
+    }
+}