Add default postgres config

Signed-off-by: Keshav Priyadarshi <git@keshav.space>

Author: keshav-space

etc/postgresql/postgresql.conf

@@ -0,0 +1,8 @@
+# Default postgresql.conf
+
+listen_addresses = '*'
+max_connections = 100
+shared_buffers = 128MB
+dynamic_shared_memory_type = posix
+max_wal_size = 1GB
+min_wal_size = 80MB