vault: Save some experiments with query properties in searches - for docs

Author: claremacrae

resources/sample_vaults/Tasks-Demo/Manual Testing/Frontmatter/Project 1.md

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+---
+project: proj1
+---
+
+# Project 1
+
+- [ ] #task Task in 'Project 1'

resources/sample_vaults/Tasks-Demo/Manual Testing/Frontmatter/Project 2.md

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+---
+project: proj2
+---
+
+# Project 2
+
+- [ ] #task Task in 'Project 2' [[#Project 2]]

resources/sample_vaults/Tasks-Demo/Manual Testing/Frontmatter/Project Search.md

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+---
+project: Project Search
+---
+
+# Project Search
+
+## Search 1
+
+```tasks
+filter by function task.file.hasProperty('project')
+group by function task.file.property('project')
+```
+
+## Search 2
+
+```tasks
+filter by function task.file.hasProperty('project')
+filter by function task.file.property('project') === query.file.property('project')
+group by function task.file.property('project')
+```
+
+## Search 3
+
+Suppose you have a project property in your query file, and you want to find all tasks that link to a note with the name of the property:
+
+```tasks
+explain
+(description includes [[{{query.file.property('project')}}]]) OR \
+(description includes [[{{query.file.property('project')}}|) OR \
+(description includes [[{{query.file.property('project')}}#) OR \
+(description includes [[#) AND (filename includes {{query.file.property('project')}})
+```
+
+## Tasks
+
+- [ ] #task Task 1 [[Project Search]]
+- [ ] #task Task 2 [[Project Search#Search 1]]
+- [ ] #task Task 3 [[Project Search|alias]]
+- [ ] #task Task 4 [[#Search 3]]

resources/sample_vaults/Tasks-Demo/Manual Testing/Frontmatter/workdate Example.md

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+---
+workdate: 2024-04-01
+groupby: group by happens
+---
+
+# workdate Example
+
+Simple use of properties in Tasks searches.
+
+## Due
+
+```tasks
+#explain
+due before {{query.file.property('workdate')}}
+{{query.file.property('groupby')}}
+limit 10
+```
+
+## Done
+
+```tasks
+#explain
+done before {{query.file.property('workdate')}}
+{{query.file.property('groupby')}}
+limit 10
+```