Add public init for Feature

[sauvikated]

It will be really nice to be able to create an instance of Feature, adding values to it and substantially create a collection of them as Features.

Scenario:

Suppose we have [String] of encoded polylines generated using - (NSString *) encodedPath on an instance of GMSPath while recoding a transportation movement by a vehicle . Documentation.

So we can

1. Iterate over the [String],
2. Decode each single encoded string
3. Create an instance of LineString from it
4. Add the LineString instance to the geometries of Feature
5. Add additional values for properties and id
6. Create a Features inserting every single Feature

[codecov]

Codecov Report

Merging #154 into develop will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           develop     #154   +/-   ##
========================================
  Coverage    71.82%   71.82%           
========================================
  Files           10       10           
  Lines          820      820           
========================================
  Hits           589      589           
  Misses         231      231

Impacted Files	Coverage Δ
GEOSwift/Feature.swift	100% <100%> (ø)	⬆️

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[macdrevx]

@sauvikated, thanks for the PR. Can you update it to be based off of develop instead of master?

[sauvikated]

@macdrevx Done.

[macdrevx]

I rebased onto develop to get rid of those merge commits.

[macdrevx]

This will go out with the next release along with #153.