feat: Add info on providers to readme

upstream.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+
+# This script is used to test an upstream server.
+
+
+# Also can test with
+# So test using https://dohjs.org/
+# Get name of server from command line
+SERVER=$1
+
+# Test Domains
+TXTDOMAIN="test.apihns"
+HTTPDOMAIN="nathan.woodburn"
+
+# Test DNS over HTTPS via GET request
+GetStandard=$(curl --silent -H 'accept: application/dns-json' 'https://'$SERVER'/dns-query?name='$TXTDOMAIN'&type=TXT')
+# Verify that the response is not empty and has an answer of TXT with content "Test"
+test=$(jq -e '.Answer[] | select(.type == 16)' <<< $GetStandard)
+if [ $test ]; then
+    echo "DNS over HTTPS GET plain request test passed with content:"
+    echo $test | jq .
+else
+    echo "DNS over HTTPS GET plain request test failed"
+fi
+
+
+# Test using curl
+curltest=$(curl --silent --doh-url https://$SERVER/dns-query http://$HTTPDOMAIN)
+# Verify that the response is not empty and has text "Nathan.Woodburn/"
+if [[ $curltest == *"Nathan.Woodburn/"* ]]; then
+    echo "DNS over HTTPS curl test passed"
+else
+    echo "DNS over HTTPS curl test failed"
+fi
+
+# Test DoT
+# Get the IP address of the server
+IP=$(dig +short $SERVER)
+# Test using kdig
+kdigtest=$(kdig +tls-ca +tls-host=$SERVER $TXTDOMAIN @$IP TXT)
+# Verify that the response is not empty and has text "Test"
+if [[ $kdigtest == *"Test"* ]]; then
+    echo "DNS over TLS kdig test passed"
+else
+    echo "DNS over TLS kdig test failed"
+fi
+
+# Plain DNS
+# Test using dig
+digtest=$(dig $TXTDOMAIN @$SERVER TXT)
+# Verify that the response is not empty and has text "Test"
+if [[ $digtest == *"Test"* ]]; then
+    echo "Plain DNS dig test passed"
+else
+    echo "Plain DNS dig test failed"
+fi