Added support for integration via Carthage and/or Workspace

[regexident]

The way HCKalmanFilter is currently set up only provides for integration through CocoaPods or plain-old manual "moving source files out of version control and adding them to your project".

For a project using Carthage this is less than ideal, if not outright unusable.

HCKalmanFilter is too nice a project to leave it on the table for every other user. 🙃

Please consider adding support for Carthage.

Ps: There is one more step required to make things work with Carthage:

• Create a tag for each version commit (starting from this current merge with 1.2.2).

[valeriyvan]

@Hypercubesoft, any plans for merging this?

[Hypercubesoft]

Hi Valeriyvan, Sorry for late replay. We were overwhelmed with work so we missed your message. We are going to do this merge in next few days.

Best Regards, Hypercybe

[regexident]

Any update on this, @Hypercubesoft?

[regexident]

@Hypercubesoft are you gonna merge this or should I just close the PR?