Create get_spaces_served_by_SWH_use.md

docs/ruleset_functions/get_spaces_served_by_SWH_use.md

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+## get_spaces_served_by_SWH_use
+
+Description: This function determines the spaces served by a given SWH use.  The convention is that if any spaces reference the swh_use, then the service water heating use applies to only those spaces. If no spaces reference the service water heating use, it applies to all spaces in the building segment.
+
+
+Inputs:
+- **RMD**
+- **swh_use**
+
+Returns:
+- **spaces_served**: a list of spaces
+
+Function Call:
+
+
+Data Lookup: None
+
+Logic:
+
+- find the building_segment that contains this swh_use by looking through each building segment: `for building_segment in RMD.building_segments:`
+    - check if the swh_use is in this building segment: `if swh_use in building_segment.service_water_heating_uses:`
+        - create a list of spaces: `spaces_served = []`
+          - look at each space in the building segment to see which of them reference the swh_use: `for space in building_segment...spaces:`
+            - if the swh_use ID is in the list of space ServiceWaterHeatingUses, then the space is one of the spaces and we add it to the list: `if swh_use.id in space.service_water_heating_uses: spaces_served.append(space)`
+        - return space_ids: `return spaces_served`
+
+
+
+**Returns** space_ids
+
+**[Back](../_toc.md)**
+
+**Notes:**
+1. relies on re-structuring of SWH as in: https://github.com/open229/ruleset-model-description-schema/issues/264