A basic direct form I FIR filter and tests

[sriyash25]

made requested changes in previous PR. Extra files: fda/fir_test.py which is the class used to pass parameters and test.txt has random values of x which are passed for simulation.

[coveralls]

Pull Request Test Coverage Report for Build 8

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+2.3%) to 46.851%

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Totals
Change from base Build 7:	2.3%
Covered Lines:	372
Relevant Lines:	794

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💛 - Coveralls

[cfelton]

I am going to merge this pull-request, note something in the future will move / change, e..g the fir_test module should evolve to the fda.fir or move to an experimental, test, or something directory.