Add instructions to README

README.md

@@ -62,7 +62,8 @@ A rapid word collection tool. See the [User Guide](https://sillsdev.github.io/Th
    5. [Generate License Reports](#generate-license-reports)
    6. [Inspect Database](#inspect-database)
    7. [Add or Update Dictionary Files](#add-or-update-dictionary-files)
-   8. [Cleanup Local Repository](#cleanup-local-repository)
+   8. [Add or Update Backend Semantic Domain Files](#add-or-update-backend-semantic-domain-files)
+   9. [Cleanup Local Repository](#cleanup-local-repository)
 3. [Setup Local Kubernetes Cluster](#setup-local-kubernetes-cluster)
    1. [Install Rancher Desktop](#install-rancher-desktop)
    2. [Install Docker Desktop](#install-docker-desktop)
@@ -461,8 +462,8 @@ To browse the database locally during development, open MongoDB Compass Communit
 ### Add or Update Dictionary Files
 
 The dictionary files for spell-check functionality in _The Combine_ are split into parts to allow lazy-loading, for the
-sake of devices with limited bandwidth. There are scripts for generating these files in `src/resources/dictionaries/`;
-files in this directory should _not_ be manually edited.
+sake of devices with limited bandwidth. These files in `src/resources/dictionaries/` are generated by scripts and should
+_not_ be manually edited.
 
 The bash script `scripts/fetch_wordlists.sh` is used to fetch dictionary files for a given language (e.g., `es`) from
 the [LibreOffice dictionaries](https://cgit.freedesktop.org/libreoffice/dictionaries/) and convert them to raw wordlists
@@ -495,6 +496,23 @@ Adjust the `-t`/`--threshold` and `-T`/`--Threshold` parameters to split a wordl
 
 The top of each language's `index.ts` file states which values of `-m`, `-t`, and `-T` were used for that language.
 
+### Add or Update Backend Semantic Domain Files
+
+The Backend semantic domain files are for generating a `.lift-ranges` file during export. (This is only when the
+projected has no imported `.lift-ranges` file). The semantic domain files `Backend/Data/ddp4-<lang>.json` are generated
+by scripts and should _not_ be manually edited.
+
+The deploy script `deploy/scripts/sem_dom_import.py` has a `--simple/-s` argument for generating these simplified domain
+files.
+
+```bash
+python ./deploy/scripts/sem_dom_import.py deploy/scripts/semantic_domains/xml/* -o Backend/Data/ -s
+```
+
+If you add or remove any languages from the contents of `Backend/Data/`, it is necessary to accordingly update the
+`<None Remove="Data\ddp4-...` and `<EmbeddedResource Include="Data\ddp4-...` lines in `Backend/BackendFramework.csproj`,
+as well as `List<string> sdLangs` in `CreateLiftRanges` in `Backend/Services/LiftServices.cs`.
+
 ### Cleanup Local Repository
 
 It's sometimes possible for a developer's local temporary state to get out of sync with other developers or CI. This