Add uwsgi examples, fixes horazont#3

Add uwsgi ini and nginx config

contrib/nginx-example-uwsgi.conf

@@ -0,0 +1,12 @@
+# Include this snippet in your nginx config.
+# Make sure to preserve the trailing slashes if you change the location.
+# Use this if you want to serve uploads from a subdirectory. The break statement
+# is needed to remove the subdirectory when making the upstream request.
+
+location /upload/ {
+    rewrite  ^/upload/(.*) /$1 break;
+    include uwsgi_params;
+    uwsgi_pass uwsgi://localhost:9002;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    client_max_body_size 100M;
+}

contrib/xmpp-http-upload.ini

@@ -0,0 +1,19 @@
+# Example ini for uwsgi usage. Adapt uid/gid to whatever user your webserver uses. 
+# This must also align with your directory permissions.
+# env must point to your xhu config file.
+
+[uwsgi]
+socket = 0.0.0.0:9002
+processes = 5
+threads = 1
+auto-procname = true
+procname-prefix-spaced = [xmpp-http-upload]
+uid = www-data
+gid = www-data
+need-plugin = python3
+chdir = /opt/xmpp-http-upload/
+pythonpath = /opt/xmpp-http-upload/
+wsgi-file = /opt/xmpp-http-upload/xhu.py
+enable-threads = true
+offload-threads = 10
+env = XMPP_HTTP_UPLOAD_CONFIG=/opt/xmpp-http-upload/config.yml