Add PhotoPrism (#15)

* Add initial configuration for PhotoPrism. Has not been tested yet, but options have been analyzed and tweaked.

* Begin testing. Fixes. Running pretty well, seems neat! Need to figure out user management other than admin.

* Add output to source so that we know it worked.

* Modify comments to explain a use free-to-win use case.

* Go ahead and give the full path on the success path.

source.env

@@ -4,6 +4,7 @@
 #   source /PATH_TO_PROJECT/source.env
 
 DIR="$(dirname -- "${BASH_SOURCE[0]}")"
+PROG="$(basename -- "${BASH_SOURCE[0]}")"
 if [[ "$DIR" == '.'* ]]; then
 	RETURN="`pwd`"
 	cd $DIR
@@ -16,3 +17,11 @@ DOCKER_PATH="$DOCKER_HOME/bin"
 PATH="$DOCKER_PATH:$PATH"
 
 export DOCKER_HOME DOCKER_PATH PATH
+
+if [[ -e $DOCKER_HOME/$PROG ]]; then
+	echo "'$DOCKER_HOME/$PROG' has been loaded successfully."
+else
+	echo "ERROR: Something has gone wrong, could not find '$PROG' from absolute "
+	echo "path, Docker Home '$DOCKER_HOME' is likely wrong."
+	exit 1
+fi