Test cases for ORM queries mentioned in book and some typo fix#53

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Commits on Aug 5, 2020

complex subquery test case added into entities app and black formatting applied on both app test file
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F expression test cases are added which will first check for simple F expression query and then a complex query which includes substr and annotation
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Join operation test added which will verify if the given django orm query is equal to given database query, also test for second largest, duplication and distinct query are also added
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test case for grouping queries are added
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bulk create query test cases are added
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object copy query test care are written
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test case added to check that only single object will be created a model
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test case for denormalized data is added
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black formatting applied for models and test files
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test case for truncate query is added and for current working cursor method changed to sqlite sql code
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test case for storing date from string into datefield is added
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test case for order by with case insensitivity is added
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test case of orderby on two fields is added
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