Update Tools/Xcode

Tools%2FXcode.md

@@ -1 +1,32 @@
-Welcome to the Wiki.
+Xcode Info
+
+---
+
+### Use System git instead of Xcode git
+
+<details>
+<summary>Explanation</summary>
+Xcode comes bundled with it's own version of git. In most cases this seems to work fine.
+
+In some scenarios I've found that Xcode is unable to bypass an authenticated proxy to fetch swift packages through ssh. In this case I run the following command to use my system git which will then also use my system in build ssh keys that I have registered against the ssh-agent.
+</details>
+
+```
+sudo defaults write com.apple.dt.Xcode IDEPackageSupportUseBuiltinSCM YES
+```
+
+---
+
+### Swift Package Manager - Cannot fetch as username does not match last
+
+This happens as there is a conflict between your last fetch of the package and new ones org id
+
+ie org-{some_number}}@github.com:auth0/JWTDecode.swift.git
+
+This needs to be changed to
+
+[git@github.com:auth0/JWTDecode.swift.git
+
+### Swift Package cannot fetch
+
+https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent