Merge pull request #5 from vnb09/fsf_tasks

Fsf tasks

Author: purusharths

FSF-2020/approximations-and-optimizations/README.md

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+# Contributor: Vaishnavi Bisht
+Github: https://github.com/vnb09
+<br/></br>
+## Sub-Topics Covered:
++ Critical Points
++ The Second Derivative Test
++ Tangent Plane Approximations
++ Total Differential
++ Lagrange Multipliers