Open Repo

1. Create new repo (My advice first add pods on a temporary repo before adding to your original project)
2. Fill Repository name with your repo name. I'll use "myrepo" for this tutorial and will use "<" and ">" symbols for the parts you should change to your own.
3. Click "Initialize this repository with a README"
4. Add a license. I'll use "MIT" for this tutorial.

Pull Your Repo to Local

1. Open Terminal.
2. Go where your repo is cd </your/path/<myrepo> or create it with cd </your/path>. mkdir <myrepo>. cd <myrepo>
3. Add git to your folder with git init
4. Link your repo with git remote add origin https://github.com/<username>/<myrepo>.git. (You can check if its working with git remote -v (Not git remove -v))
5. Pull your repo from github with git pull
6. Type: git pull origin master
7. Type git commit

Add Cocoapods

1. Install cocoapods: sudo gem install cocoapods. Write pod --help to check if it's working. (Skip if you already have cocoapods)
2. Create <myrepo>.podspec with touch <myrepo>.podspec
3. Open <myrepo>.podspec with an editor. Use Xcode or Sublime Text.
4. Paste the following. You can checkout this example. For details check the documentation

Pod::Spec.new do |s|
s.name             = "<myrepo>"
s.version          = "0.1"
s.summary          = "<My summary>"
s.description      = "<MUST BE LONGER THAN SUMMARY>"
s.homepage         = "https://github.com/<username>/<myrepo>"
s.license          = 'MIT'
s.author           = { "<username>" => "<useremail>" }
s.source           = { :git => "https://github.com/<username>/<myrepo>.git", :tag => s.version.to_s }
s.platform     = :ios, '8.0'
s.requires_arc = true

# If more than one source file: https://guides.cocoapods.org/syntax/podspec.html#source_files
s.source_files = '<myrepo>.swift' 

end

4. Write pod lib lint <myrepo>.podspec to the terminal. If you have any errors write pod lib lint <myrepo>.podspec --verbose. Solve your errors (solving your errors could take some time can't help here).
5. Add newly changes to git with git add . then commit with git commit -m "Added pods"
6. Push your changes to your remote repo with git push
7. Create new release https://github.com// Click Releases -> Click New Version
8. Write "0.1" to Tag Version. (Optional you can fill the "Release Title"). Make sure the version is identical with the s.version inside <myrepo>.podspec
9. Write pod trunk register [email protected] 'Your Name' --description='macbook pro'
10. After your new release open terminal and write pod trunk push <myrepo>.podspec. This will change the CocoaPods Specs which will enable you to write pod '<myrepo>' inside your podfile