add example apache config + readme notes

contrib/apache/copyparty.conf

@@ -0,0 +1,15 @@
+# when running copyparty behind a reverse proxy,
+# the following arguments are recommended:
+#
+#   --http-only     lower latency on initial connection
+#   -i 127.0.0.1    only accept connections from nginx
+#
+# if you are doing location-based proxying (such as `/stuff` below)
+# you must run copyparty with --rp-loc=stuff
+#
+# on fedora/rhel, remember to setsebool -P httpd_can_network_connect 1
+
+LoadModule proxy_module modules/mod_proxy.so
+ProxyPass "/stuff" "http://127.0.0.1:3923/stuff"
+# do not specify ProxyPassReverse
+RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}