add statistics docs, fix java statistics API endpoint

docs/Statistics_API.MD

@@ -0,0 +1,48 @@
+# Statistics API
+
+This is documentation for the Statistics API.
+
+## GET /statistics/api/skins
+
+### Parameters
+**No parameters**
+
+### Returns
+JSON string containing amount of skins cached, amount of skins overridden, epoch timestamp of previous skin cache wipe, epoch timestamp of next skin cache wipe.
+
+### Sample Resoponse
+**MIME Type:** application/json
+
+```json
+{"cached":0,"overridden":0,"cache_wipe_time":1610029624092,"previous_cache_wipe_time":1609943224092}
+```
+
+## GET /statistics/api/capes
+
+### Parameters
+**No parameters**
+
+### Returns
+JSON string containing amount of capes cached, amount of capes overridden, epoch timestamp of previous cape cache wipe, epoch timestamp of next cape cache wipe.
+
+### Sample Resoponse
+**MIME Type:** application/json
+
+```json
+{"cached":0,"overridden":0,"cache_wipe_time":1610116024092,"previous_cache_wipe_time":1609943224092}
+```
+
+## GET /statistics/api/java
+
+### Parameters
+**No parameters**
+
+### Returns
+JSON string containing versions of Java that have connected to this skins server (has count of each time).
+
+### Sample Response
+**MIME Type:** application/json
+
+```json
+{"Java/1.8.0_74":1}
+```

index.js

@@ -490,7 +490,7 @@ app.get('/statistics/java', async (req,res) => {
 // Returns:
 //    - Java versions that have "phoned home" on MC client startup.
 
-app.get('/statisticss/api/java', async (req,res) => {
+app.get('/statistics/api/java', async (req,res) => {
     var javajson;
     if (fs.existsSync(Java_JSON)) {
         javajson = require(Java_JSON)