Add document about basics of working with expressions #668
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Which issue does this PR close?
Closes #667.
Rationale for this change
The bug report was not an actual bug, but rather a lack of documentation about how to perform the boolean operations on expressions. This change adds in a new page to the documentation that describes a few basics of working with expressions for new users.
What changes are included in this PR?
This change adds a page under Basic Operations called Expressions and details some basics of creating expressions and performing boolean operations.
Are there any user-facing changes?
Only documentation is changed.