middleware: change documentation filenames to README.md

middleware/loadbalance/README.md

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+# loadbalance
+
+`loadbalance` acts as a round-robin DNS loadbalancer by randomizing A and AAAA records in the
+message. See [Wikipedia](https://en.wikipedia.org/wiki/Round-robin_DNS) about the pros and cons
+on this setup.
+
+It will take care to sort any CNAMEs before any address records.
+
+## Syntax
+
+~~~
+loadbalance [policy]
+~~~
+
+* `policy` is how to balance, the default is "round_robin"
+
+## Examples
+
+~~~
+loadbalance round_robin
+~~~