Add description Go/forgejo Installation and Testing

doc/GoForgejo_install.md

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+# Go / forgejo Installation and Testing 
+
+## go install/update
+#### remove old version
+sudo rm -rf ~/go
+### download latest version and configure  
+curl -OL https://go.dev/dl/$(curl 'https://go.dev/VERSION?m=text').linux-amd64.tar.gz
+
+extract latest version to ~/go
+tar -C ~ -xzf go*.linux-amd64.tar.gz
+
+APPEND='export PATH=$PATH:$HOME/go/bin'
+
+echo $APPEND >> $HOME/.profile
+
+## VScode optional - TODO!?!
+Go extension autoinstall  
+install gpls, div, etc.
+
+## Testing forgejo
+full:
+make test
+
+require node:
+make test-frontend
+
+require go:
+make test-backend
+
+#nvm - required to build forgejo frontend
+sudo apt remove nodejs
+sudo apt autoremove
+
+adapt version to latest:
+curl o https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.3/install.sh | bash
+nvm install
+
+optional:
+nvm alias default "latest"
+
+## forgejo build
+TAGS="bindata" make build
+-> include make frontend & make backend //see details Makefile