Initla commit (#389).

src/main/java/org/gitlab4j/api/models/ProtectedTag.java

+package org.gitlab4j.api.models;
+
+import java.util.List;
+
+import org.gitlab4j.api.utils.JacksonJson;
+
+public class ProtectedTag {
+
+    public static class CreateAccessLevel {
+
+        private AccessLevel access_level;
+        private String accessLevelDescription;
+
+        public AccessLevel getAccess_level() {
+            return access_level;
+        }
+
+        public void setAccess_level(AccessLevel access_level) {
+            this.access_level = access_level;
+        }
+
+        public String getAccessLevelDescription() {
+            return accessLevelDescription;
+        }
+
+        public void setAccessLevelDescription(String accessLevelDescription) {
+            this.accessLevelDescription = accessLevelDescription;
+        }
+    }
+
+    private String name;
+    private List<CreateAccessLevel> createAccessLevels;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public List<CreateAccessLevel> getCreateAccessLevels() {
+        return createAccessLevels;
+    }
+
+    public void setCreateAccessLevels(List<CreateAccessLevel> createAccessLevels) {
+        this.createAccessLevels = createAccessLevels;
+    }
+
+    @Override
+    public String toString() {
+        return (JacksonJson.toJsonString(this));
+    }
+}

src/test/resources/org/gitlab4j/api/protected-tags.json

+[
+  {
+    "name": "release-1-0",
+    "create_access_levels": [
+      {
+        "access_level": 40,
+        "access_level_description": "Maintainers"
+      }
+    ]
+  },
+  {
+    "name": "*-stable",
+    "create_access_levels": [
+      {
+        "access_level": 30,
+        "access_level_description": "Developers + Maintainers"
+      }
+    ]
+  }
+]
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