Add branch type (#66)

Author: Tristan-WorkGH

src/main/java/org/gridsuite/studyconfig/server/constants/SheetType.java

@@ -12,22 +12,23 @@
 
 // Must be in-sync with EQUIPMENT_TYPES in spreadsheet front component
 public enum SheetType {
-    SUBSTATION,
-    VOLTAGE_LEVEL,
-    LINE,
-    TWO_WINDINGS_TRANSFORMER,
-    THREE_WINDINGS_TRANSFORMER,
+    BATTERY,
+    BRANCH,
+    BUS,
+    BUSBAR_SECTION,
+    DANGLING_LINE,
     GENERATOR,
+    HVDC_LINE,
+    LCC_CONVERTER_STATION,
+    LINE,
     LOAD,
     SHUNT_COMPENSATOR,
     STATIC_VAR_COMPENSATOR,
-    BATTERY,
-    HVDC_LINE,
-    LCC_CONVERTER_STATION,
-    VSC_CONVERTER_STATION,
-    DANGLING_LINE,
-    BUS,
+    SUBSTATION,
+    THREE_WINDINGS_TRANSFORMER,
     TIE_LINE,
-    BUSBAR_SECTION
+    TWO_WINDINGS_TRANSFORMER,
+    VOLTAGE_LEVEL,
+    VSC_CONVERTER_STATION
 }