Update README.md

Author: oraclejedi

python/README.md

@@ -22,3 +22,41 @@ If replication is not specified, both the source and target protection groups ar
 If the JSON file does not specify authentication credentials, the code will try to read the OS variables FA_HOST and API_TOKEN for authentication to the source Flash Array.\
 If the JSON file does not specify authentication credentials, the code will try to read the OS variables FA_HOST_TGT and API_TOKEN_TGT for authentication to the target Flash Array.\
 
+# Excluding Volumes in the Protection Group
+
+In some scenarios you may with to exclude volumes from the snapshot-copy.  For example, VVOLs include a config VVOL that must NOT be overwritten.  In this example, the JSON file allows the user to specify source volumes in the protection group that will NOT be sync'd to target volumes in the target protection group.
+
+# A Worked Example
+<code>
+[oracle@gct-oradb-demo-dev01 py]$  python fa_pg_snap.py -f fa27b.json -n dec051652 -r -s gct-oradb-demo-prd01-pg -x
+============
+fa_pg_snap.py 1.0.0 started at 2025-12-05 16:54:31.063118
+============
+connecting to Flash Array:sn1-x90r2-f06-27.puretec.purestorage.com
+connected
+============
+connecting to Flash Array:sn1-x90r2-f06-33.puretec.purestorage.com
+connected
+============
+determining if snapshot dec051652 exists for source pg:gct-oradb-demo-prd01-pg
+snapshot dec051652 exists
+source protection group:gct-oradb-demo-prd01-pg
+target protection group:Not Defined
+============
+querying the volumes for protection group:gct-oradb-demo-prd01-pg
+gct-oradb-demo-prd01-data-00
+gct-oradb-demo-prd01-data-01
+gct-oradb-demo-prd01-fra-00
+gct-oradb-demo-prd01-fra-01
+============
+excluding:{'volume_id': 'xxdd246ff7-9104-71cd-0320-8915f47aa77e'}
+excluding:{'volume_id': 'dd246ff7-9104-71cd-0320-8915f47aa77e'}
+============
+listing the volumes for snapshot:dec051652
+name:sn1-x90r2-f06-27:gct-oradb-demo-prd01-pg.dec051652.gct-oradb-demo-prd01-data-00 size:120.0 GB
+name:sn1-x90r2-f06-27:gct-oradb-demo-prd01-pg.dec051652.gct-oradb-demo-prd01-data-01 size:120.0 GB
+name:sn1-x90r2-f06-27:gct-oradb-demo-prd01-pg.dec051652.gct-oradb-demo-prd01-fra-00 size:40.0 GB
+name:sn1-x90r2-f06-27:gct-oradb-demo-prd01-pg.dec051652.gct-oradb-demo-prd01-fra-01 size:40.0 GB
+============
+program terminated
+</code>