Add e2e dashboard backend documentation and Dockerfile#351

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Aman-Codes wants to merge 2 commits intolitmuschaos:masterfrom

Aman-Codes:doc-dashboard-backend

Commits on Dec 5, 2021

update dashboard backend README
Aman-Codes
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Commits on Dec 6, 2021

add Dockerfile for dashboard backend
Aman-Codes
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