Add readme

Added instructions for APT repository

README.md

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+# Linux Registry Usage
+These are the usage instructions for the cloudyne package repository for linux packages
+
+## Aptitude
+```bash
+# Ensure prerequisites are installed
+apt-get update 
+apt-get -y install gnupg2 apt-transport-https curl
+
+# Download and import the public key for verifying packages
+sudo curl https://pkg.cloudyne.io/debian/repository.key -o /etc/apt/trusted.gpg.d/cloudyne.asc
+
+# Add the package repository
+source /etc/os-release
+sudo echo "deb https://pkg.cloudyne.io/debian ${VERSION_CODENAME} main" | tee /etc/apt/sources.list.d/cloudyne.list
+
+# Check that the repository works
+sudo apt-get update
+```