add readme. set default value on error for override limit to global limit

Author: voidstarr

README.md

@@ -0,0 +1,49 @@
+# Altimeter
+
+### [Discord](https://discord.gg/eeZbM9umBy)
+
+Sponge API 7.3.x Plugin that limits the number of accounts that can connect from an IP address
+
+##The gist
+A list exists per IP, each list can hold up to X accounts and each account will be removed from the queue until the TTL expires.
+If the list fills for that IP, no more accounts can be logged in from that IP.
+
+## Definitions
+* TTL: `Time to live`
+
+## Commands
+* `/altimeter`: lists sub commands
+* `/altimeter clear [all|x.x.x.x]`: clear the all account list, or the account list associated with a given IP address (v4/v6)
+* `/altimeter override x.x.x.x <limit>`: set account limit for `x.x.x.x` to `limit`
+
+## Permissions
+* `altimeter.override`
+* `altimeter.clear.ip`
+* `altimeter.clear.all`
+
+## Configuration
+```
+altimeter {
+    # How many accounts from one IP can log in.
+    accountLimit=5
+    # How often accounts should be checked and cleared from IP lists.
+    checkInterval {
+        # DAYS, HOURS, MINUTES, or SECONDS
+        unit=MINUTES
+        value=5
+    }
+    # Override account limit for specific IPs
+    limitOverrides=[
+        {
+            ip="127.0.0.1"
+            limit=5
+        }
+    ]
+    # How long after an account is added to the queue is it removed.
+    ttl {
+        # DAYS, HOURS, MINUTES, or SECONDS
+        unit=DAYS
+        value=30
+    }
+}
+```

src/main/java/tv/voidstar/altimeter/AltimeterConfig.java

@@ -98,9 +98,10 @@ public static void load() {
             Altimeter.getLogger().info("load limit overrides data");
             for (ConfigurationNode overrideNode : limitOverridesNode.getChildrenList()) {
                 String ip = overrideNode.getNode("ip").getString("in.va.li.d");
+                int limit = overrideNode.getNode("limit").getInt(accountLimit);
                 if (InetAddresses.isInetAddress(ip)) {
-                    accountLimitOverrides.put(ip, overrideNode.getNode("limit").getInt(5));
-                    Altimeter.getLogger().info("{} has {} account limit", ip, overrideNode.getNode("limit").getInt(5));
+                    accountLimitOverrides.put(ip, limit);
+                    Altimeter.getLogger().info("{} has {} account limit", ip, limit);
                 } else {
                     Altimeter.getLogger().error("Invalid IP in limitOverrides configuration {}", ip);
                 }