Add cheat for dpkg

cheat/cheatsheets/dpkg

@@ -0,0 +1,11 @@
+# Install the package or upgrade it
+dpkg -i test.deb
+
+# Remove a package including configuration files
+dpkg -P test.deb
+
+# List all installed packages with versions and details
+dpkg -I
+
+# Find out if a Debian package is installed or not
+dpkg -s test.deb | grepStatus