Export to xls

[sultanassi95]

Relates: #92 #8
As a user, I can export mentor information as xls, AND/OR also all mentors

Acceptance Criteria:

Back End:

• Routes:
• '/dashboard/mentor-panel/export-mentor/:mentorID'
• '/dashboard/mentor-panel/export-mentors'

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• Controllers: Mentor Side: back-end: Controllers: #50
• add and code ("./src/backEnd/controllers/getMentorXLS.js)
• add and code ("./src/backEnd/controllers/getAllMentorsXLS.js")

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• DB-Queries:
• USE: selectSingleMentors(id, cb);
• USE: selectMentors(cb)

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Design with React:

• add buttons:
• button "Export Mentor Details" - on : mentorProfile component
• button "Export Mentors Details" - on : dashboard component