Added readme to server registry.

registry/README.md

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+# Ace of Shades Server Registry
+The registry is a REST API that keeps track of any servers that have recently announced their status to it. Servers can periodically send a simple JSON object with metadata about the server (name, description, players, etc.) so that players can more easily search for a server to play on.
+
+### Fetching
+Client/launcher applications that want to get a list of servers from the registry should send a GET request to the API's `/servers` endpoint.
+
+The following array of servers is returned from GET requests to the API's `/servers` endpoint:
+```json
+[
+    {
+        "host": "0:0:0:0:0:0:0:1",
+        "port": 1234,
+        "name": "Andrew's Server",
+        "description": "A good server.",
+        "maxPlayers": 32,
+        "currentPlayers": 2,
+        "lastUpdatedAt": 1659710488855
+    }
+]
+```
+
+### Posting
+The following payload should be sent by servers to the API's `/servers` endpoint via POST:
+```json
+{
+    "port": 1234,
+    "token": "abc123",
+    "name": "Andrew's Server",
+    "description": "A good server.",
+    "maxPlayers": 32,
+    "currentPlayers": 2
+}
+```
+Note that this should only be done at most once per minute. Any more frequent, and you'll receive 429 Too-Many-Requests responses, and continued spam may permanently block your server.

registry/src/test/java/nl/andrewl/aos2registryapi/Aos2RegistryApiApplicationTests.java

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+package nl.andrewl.aos2registryapi;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class Aos2RegistryApiApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}