Issue when creating my first CocoaPod

Add a 0.1.0 version for your github repo. Image from Github incase the link dies:

You have pointed to a branch called 0.1.0 in your podspec, and you simply need to push a branch of that name to github. Many people use tags instead of branches to indicate which commit to use for each pod version, and I suggest that you do this instead of pointing to a branch. Please post the source section of your podspec for more specific details.

You can also add a tag to your branch in terminal:

git tag 0.1.0
git push --tags