Prepare exception and error codes for error handling

src/main/java/cz/brmlab/wm/utils/Exceptions/BrmException.java

@@ -0,0 +1,9 @@
+package cz.brmlab.wm.utils.Exceptions;
+
+import lombok.Data;
+
+@Data
+public class BrmException extends Exception {
+    private final String message;
+    private final ExitCode exitCode;
+}

src/main/java/cz/brmlab/wm/utils/Exceptions/ExitCode.java

@@ -0,0 +1,20 @@
+package cz.brmlab.wm.utils.Exceptions;
+
+import lombok.Getter;
+
+public enum ExitCode {
+
+    CONFIGURATION_MISSING(10, "Missing configuration property: ");
+
+    @Getter
+    private String reason;
+    @Getter
+    private int code;
+
+    ExitCode(int code, String reason) {
+        this.code = code;
+        this.reason = reason;
+    }
+
+
+}