feat: add initial file structure

debye_bec/file_writer/__init__.py

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+from .debye_nexus_structure import DebyeNexusStructure

debye_bec/file_writer/debye_nexus_structure.py

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+from bec_server.file_writer.default_writer import DefaultFormat
+
+class DebyeNexusStructure(DefaultFormat):
+    """ Nexus Structure for Debye"""
+
+    def format(self) -> None:
+        """ Specify the file format for the file writer."""
+
+        entry = self.storage.create_group(name="entry")
+        entry.attrs["NX_class"] = "NXentry"
+        instrument = entry.create_group(name="instrument")
+        instrument.attrs["NX_class"] = "NXinstrument"
+        monochromator = instrument.create_group(name="monochromator")
+        # monochromator.attrs["NX_class"] = "NXmonochromator" -> to be checked
+        crystal = monochromator.create_group(name="crystal")
+
+        ###################
+        ## mo1_bragg specific information
+        ###################
+
+        # Logic if device exist
+        if "mo_trx" in self.device_manager.devices:
+            # Create a softlink
+            chemical_formular = crystal.create_soft_link(name="chemical_formular", target="/entry/collection/devices/mo_trx/mo_trx")
+            chemical_formular.attrs["NX_class"] = "NXdata"
+