Add separators.md file to defaults docs

docs/defaults/separators.md

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+# Separators Default Metadata File
+
+Separators are a special form of collections which are used similar to index cards in a library, they help to "split up" collections by identifying categories (such as "Studio Collections" and "Holiday Collections").
+
+These are empty collections which do not contain any movies/shows themselves, but highlight that the the collections which follow it are of a certain category.
+
+Below is an example of a separator, which can be seen surrounded by a red square.
+
+![](images/separators.jpg)
+
+Separators are enabled by default, but can be disabled/enabled per-file and per-library.
+
+An example of disabling separators at the library-level cam be seen here
+
+```yaml
+libraries:
+  Movies:
+    template_variables:
+      use_separator: false
+```
+
+And at the file-level
+
+```yaml
+libraries:
+  Movies:
+    metadata_path:
+      - pmm: studio
+        template_variables:
+          use_separator: false
+```
+
+## Alternative Styles
+
+Multiple styles are available for Separators, to match Plex's "categories" feature.
+
+The available styles avaiable are:
+
+| Style           | Value  |
+|:----------------|:------:|
+| Original        |  orig  |
+| Blue            |  blue  |
+| Brown           |  stb   |
+| Gray            |  gray  |
+| Green           | green  |
+| Purple          | purple |
+| Red             |  red   |
+
+This image shows an example separator in each of the above styles
+
+![](images/separators2.jpg)
+
+The style of separator can be defined per-file and per-library.
+
+An example of disabling separators at the library-level cam be seen here
+
+```yaml
+libraries:
+  Movies:
+    template_variables:
+      sep_style: red
+```
+
+And at the file-level
+
+```yaml
+libraries:
+  Movies:
+    metadata_path:
+      - pmm: studio
+        template_variables:
+          sep_style: stb
+```
+
+