exam crud & /save/scan response

[Re4LyZed]

added guidance in README on how to access API /docs

implementation of the following issues done:

37 exam CRUD

us2 GET /exams{OptionalQuery: year, OptionalQuery:subject} return list of exams for (optional) year, (optional) subject

us3 GET /exams/{id} return all information of exam like response of /scan/save POST /exams/{id} for total_score POST /exercises/{id} for score

39 /scan/save - response

/scan/save - return response

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