Add metadata files for Hydrography category

Author: ChrisFrenchPDX

hydrography/add-enc-exchange-set/README.metadata.json

@@ -0,0 +1,33 @@
+{
+    "category": "Hydrography",
+    "description": "@@TODO: Display nautical charts conforming to the ENC specification.",
+    "ignore": false,
+    "images": [
+        "AddEncExchangeSet.png"
+    ],
+    "keywords": [
+        "Data",
+        "ENC",
+        "maritime",
+        "nautical chart",
+        "layers",
+        "hydrographic",
+        "EncCell",
+        "EncDataset",
+        "EncExchangeSet",
+        "EncLayer"
+    ],
+    "redirect_from": "/java/latest/sample-code/add-enc-exchange-set.htm",
+    "relevant_apis": [
+        "EncCell",
+        "EncDataset",
+        "EncExchangeSet",
+        "EncLayer"
+    ],
+    "snippets": [
+        "@@TODO: *** PLEASE VERIFY THE INCLUSION OF THESE SNIPPETS ***",
+        "src/main/java/com/esri/samples/add_enc_exchange_set/AddEncExchangeSetSample.java",
+        "src/main/java/com/esri/samples/add_enc_exchange_set/AddEncExchangeSetLauncher.java"
+    ],
+    "title": "@@TODO: Add ENC exchange set"
+}