Aggiunti altri esercizi in java

reverse-string/.exercism/config.json

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+{
+  "authors": [
+    "bmkiefer"
+  ],
+  "contributors": [
+    "barisozcanli",
+    "FridaTveit",
+    "ikhadykin",
+    "jmrunkle",
+    "Kyle-Pu",
+    "lemoncurry",
+    "mirkoperillo",
+    "msomji",
+    "muzimuzhi",
+    "ppiliar",
+    "sjwarner",
+    "sjwarner-bp",
+    "SleeplessByte",
+    "Smarticles101",
+    "sshine"
+  ],
+  "files": {
+    "solution": [
+      "src/main/java/ReverseString.java"
+    ],
+    "test": [
+      "src/test/java/ReverseStringTest.java"
+    ],
+    "example": [
+      ".meta/src/reference/java/ReverseString.java"
+    ],
+    "invalidator": [
+      "build.gradle"
+    ]
+  },
+  "blurb": "Reverse a string.",
+  "source": "Introductory challenge to reverse an input string",
+  "source_url": "https://medium.freecodecamp.org/how-to-reverse-a-string-in-javascript-in-3-different-ways-75e4763c68cb"
+}

reverse-string/.exercism/metadata.json

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+{"track":"java","exercise":"reverse-string","id":"71c7d20c78884493a5fe4d879fbbcfd7","url":"https://exercism.org/tracks/java/exercises/reverse-string","handle":"GicoProgram","is_requester":true,"auto_approve":false}