Adding Mean_filter_2D after restructuring

[Mainak431]

No description provided.

[seanpmorgan]

Generally looks very good... thank you for the contribution! Could you address the comments below?

[seanpmorgan]

When time allows please update as shown in #202 described in #199 .

Sorry for the several iterations here...

[Mainak431]

@seanpmorgan Please review and merge.

[seanpmorgan]

@Mainak431 Looks like tests are failing... almost ready to merge though

[Mainak431]

@seanpmorgan Test cases fixed. Please, see #223 also.

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[seanpmorgan]

Thanks @Mainak431 !