docs: add documentation about the EMu views

Just preps for the moment but with the intention to expand later

dataimporter/emu/views/README.md

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+# EMu views
+
+This directory contains the views derived from EMu data.
+Each module contains one view subclass along with any additional functions required to
+make the view work.
+Additionally, there is a `utils` module containing common functions and variables.
+
+## Common checks
+
+### Departments
+
+In ecatalogue derived views it is common for the first value in the `ColDepartment`
+field to be checked against this list of values:
+
+- Botany
+- Entomology
+- Mineralogy
+- Palaeontology
+- Zoology
+
+If the value is in this list then the record is valid and can proceed with any other
+filter checks.
+
+### Disallowed states
+
+In ecatalogue derived views it is common for the first value in the `SecRecordStatus`
+field to be checked against this list of values:
+
+- DELETE
+- DELETE-MERGED
+- DUPLICATION
+- Disposed of
+- FROZEN ARK
+- INVALID
+- POSSIBLE TYPE
+- PROBLEM
+- Re-registered in error
+- Reserved
+- Retired
+- Retired (see Notes)
+- SCAN_cat
+- See Notes
+- Specimen missing - see notes
+- Stub
+- Stub Record
+- Stub record
+
+If the value matches any of these values it will be rejected.
+
+## View Definitions
+
+### preparation
+
+Represents a preparation record and is published to the sample dataset on the Data
+Portal.
+
+#### Filter flowchart
+```mermaid
+flowchart TD
+    START(ecatalogue record)
+    PREP{ColRecordType is preparation}
+    MCF{ColSubDepartment is molecular collections}
+    MGP{ColRecordType is mammal group part}
+    MAMMALS{ColSubDepartment is ls mammals}
+    DTOL{NhmSecProjectName first value is Darwin Tree of Life}
+    WP{AdmPublishWebNoPasswordFlag first value is y}
+    GUID{AdmGUIDPreferredValue first value is valid GUID}
+    DIS{SecRecordStatus first value is in list of disallowed states}
+    DEPT{ColDepartment first value is in list of allowed departments}
+    LOAN1{LocPermanentLocationRef first value is 3250522}
+    LOAN2{LocCurrentSummaryData contains the word loan}
+    NO[Reject]
+    YES[Success, is preparation record]
+
+    START --> PREP
+    PREP -->|Yes| MCF
+    PREP -->|No| MGP
+    MCF -->|Yes| WP
+    MCF -->|No| NO
+    MGP -->|Yes| MAMMALS
+    MGP -->|No| NO
+    MAMMALS -->|Yes| DTOL
+    MAMMALS -->|No| NO
+    DTOL -->|Yes| WP
+    DTOL -->|No| NO
+    WP -->|Yes| GUID
+    WP -->|No| NO
+    GUID -->|Yes| DIS
+    GUID -->|No| NO
+    DIS -->|No| DEPT
+    DIS -->|Yes| NO
+    DEPT -->|Yes| LOAN1
+    DEPT -->|No| NO
+    LOAN1 -->|Yes| LOAN2
+    LOAN1 -->|No| NO
+    LOAN2 -->|Yes| YES
+    LOAN2 -->|No| NO
+```