Added text for currently unsupported layers

src/main/resources/templates/caffe2/elements/Add.ftl

-    		${element.name} = ${tc.join(element.inputs, " + ")}
-<#include "OutputShape.ftl">
\ No newline at end of file
+<#-- This layer is currently not supported -->

src/main/resources/templates/caffe2/elements/BatchNorm.ftl

-    		${element.name} = mx.symbol.BatchNorm(data=${element.inputs[0]},
-    		    fix_gamma=${element.fixGamma?string("True","False")},
-    		    name="${element.name}")
+<#-- This layer is currently not supported -->

src/main/resources/templates/caffe2/elements/Concatenate.ftl

-    		${element.name} = mx.symbol.concat(${tc.join(element.inputs, ", ")},
-    		    dim=1,
-    		    name="${element.name}")
-<#include "OutputShape.ftl">
\ No newline at end of file
+<#-- This layer is currently not supported -->

src/main/resources/templates/caffe2/elements/Get.ftl

-    		${element.name} = ${element.inputs[element.index]}
+<#-- This layer is currently not supported -->

src/main/resources/templates/caffe2/elements/Split.ftl

-    		${element.name} = mx.symbol.split(data=${element.inputs[0]},
-    		    num_outputs=${element.numOutputs?c},
-    		    axis=1,
-    		    name="${element.name}")
-<#include "OutputShape.ftl">
\ No newline at end of file
+<#-- This layer is currently not supported -->