Aggiunti alcuni esercizi di java.

bird-watcher/.exercism/config.json

@@ -0,0 +1,24 @@
+{
+  "authors": [
+    "samuelteixeiras",
+    "ystromm"
+  ],
+  "files": {
+    "solution": [
+      "src/main/java/BirdWatcher.java"
+    ],
+    "test": [
+      "src/test/java/BirdWatcherTest.java"
+    ],
+    "exemplar": [
+      ".meta/src/reference/java/BirdWatcher.java"
+    ],
+    "invalidator": [
+      "build.gradle"
+    ]
+  },
+  "forked_from": [
+    "csharp/bird-watcher"
+  ],
+  "blurb": "Learn about arrays by keeping track of how many birds visit your garden."
+}

bird-watcher/.exercism/metadata.json

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+{"track":"java","exercise":"bird-watcher","id":"fe28f433028641dc96ee1cc7c285d8d9","url":"https://exercism.org/tracks/java/exercises/bird-watcher","handle":"GicoProgram","is_requester":true,"auto_approve":false}