Add chapter about searching

Signed-off-by: trivernis <trivernis@protonmail.com>

_config.yml

@@ -19,6 +19,7 @@ kramdown:
   syntax_highlighter: rouge
   line_numbers: true
 
+
 badges:
   - img: https://img.shields.io/github/v/release/trivernis/mediarepo?include_prereleases&style=for-the-badge
     href: https://github.com/Trivernis/mediarepo/releases

_docs/40_tagging.md

@@ -2,7 +2,6 @@
 layout: doc
 title: Tagging
 sort_index: 40
-draft: false
 ---
 
 The main feature of mediarepo is associating tags with files. 

_docs/50_searching.md

@@ -0,0 +1,88 @@
+---
+layout: doc
+title: Searching
+sort_index: 50
+---
+
+Now that our files have tags assigned we can use those tags for searching. 
+Searching is only possible in the *Files* tab so if you haven't already you
+need to open one now.
+We need to switch our side menu to *Search* mode (1).
+
+![](/assets/images/mediarepo-search.png)
+
+Now you can enter filter expressions in the corresponding input field (2).
+You can enter any of the tags you've previously assigned. If it exists
+you should see it in the suggestions.
+After entering a tag it will appear in the line above (3) and start
+searching. You can prefix your query with a minus `-` to negate it.
+
+## Wildcards
+
+Searching with wildcards *\** is also possible. A wildcard must be positioned
+at the end of a query entry to be interpreted as one. Valid entries would be:
+
+- `sno*` - searching by all tags beginning with *sno*
+- `season:*` - searching by all tags within the *season* namespace
+
+## OR Expressions
+
+The more tags you enter the more restricted the search result becomes.
+But in some cases you might want to filter by either of some tags.
+This is possible by separating two entries with the keyword *OR*.
+For example:
+
+- `season:winter OR river`
+- `snow OR rabbit OR forest`
+
+![](/assets/images/search-with-or.png)
+
+## Search dialog
+
+You can get a better overview of your current search query by pressing the
+funnel icon in the search input element.
+This will open a search dialog displaying the current search expression as
+a list rather than in one line.
+
+![](/assets/images/filter-dialog.png)
+
+Expressions with an OR combinator are displayed in dark boxes (1).
+Stand-alone expressinos are displayed outside these boxes (2).
+You an enter additional queries in the bottom input field (3) and filter
+by those once you're ready (4).
+
+You're also able to select the single entries and by right clicking one 
+open a menu with additional options.
+
+![](/assets/images/search-dialog-contextmenu.png)
+
+All entries can be removed (1). You can convert the selected entries to other
+expression types removing them from their original expression (2 and 3) or
+copy them to a new expression without removing them (4 and 5).
+
+## Searching by properties
+
+Files are stored with several properties which can be used in searches too.
+To search by file properties you have to prefix your query with a dot `.` .
+Properties that can be used in searches are:
+
+- status
+- file size
+- imported time
+- changed time
+- created time
+- tag count
+- content descriptor (CD)
+
+Depending on the property different types of comparators are valid.
+Status and content descriptor can only be searched by an equal `=` comparator
+while the remaining entries can also additionally 
+be searched with the less `<` and greater `>` comparator e.g.
+
+- `.Status = Imported`
+- `.FileSize > 10MB`
+- `.FileImportedTime < 2022-01-12T00:00:00`
+- `.TagCount > 15`
+- `.ContentDescriptor = 28g5gfpdvcvlua15gq6etq8e65tol4113e0kudcjjajkgmsj9aefimg`
+
+![](/assets/images/property-filters.png)