Add Readme file

Author: Foivos Filippopoulos

README.md

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+# gcp-disk-snapshotter
+
+Service to periodically take snapshots of `gcp` disks, based on particular labels.
+Snapshots (only the ones created by the service) are deleted when they become older than the specified retention time.
+
+## Usage
+```
+ -interval_secs int
+        Interval between snapshots in seconds. Defaults to 43200s = 12h (default 43200)
+  -labels string
+        (Required) Comma separated list of disk labels in format <name>:<value>
+  -project string
+        (Required) GCP Project to use
+  -retention_hours int
+        Retention Duration in hours. Defaults to 720h = 1 month (default 720)
+  -snap_prefix string
+        Prefix for created snapshots
+  -zones string
+        (Required) Comma separated list of zones where projects disks may live
+```