public void addVariable(@Nonnull String className, @Nonnull String methodName, @Nonnull String methodDesc,
	                        @Nonnull String originalName, @Nullable String desc, int index, @Nonnull String renamedName) {
		MappingKey key = getVariableKey(className, methodName, methodDesc, originalName, desc, index);
		mappings.put(key, renamedName);
	}
Add mapping for variable name.

@param className
		Class name defining the method.
@param methodName
		Method name.
@param methodDesc
		Method descriptor.
@param originalName
		Variable original name.
@param desc
		Variable descriptor.
@param index
		Variable index.
@param renamedName
		New name of the variable.
recaf-core/src/main/java/software/coley/recaf/services/mapping/MappingsAdapter.java