add tags to patterns

Author: PhilWun

src/main/java/io/github/patternatlas/api/entities/Pattern.java

@@ -52,4 +52,6 @@ public class Pattern extends EntityWithURI {
 
     @Column(columnDefinition = "boolean default false")
     private Boolean deploymentModelingBehaviorPattern;
+
+    private String tags;
 }

src/main/java/io/github/patternatlas/api/rest/model/PatternModel.java

@@ -29,6 +29,8 @@ public class PatternModel {
     private Boolean deploymentModelingBehaviorPattern;
     private Boolean deploymentModelingStructurePattern;
 
+    protected String tags;
+
     @JsonIgnore
     protected Pattern pattern;
 
@@ -43,6 +45,7 @@ private PatternModel(Pattern pattern) {
         this.patternLanguageName = patternLanguage.getName();
         this.deploymentModelingBehaviorPattern = pattern.getDeploymentModelingBehaviorPattern();
         this.deploymentModelingStructurePattern = pattern.getDeploymentModelingStructurePattern();
+        this.tags = pattern.getTags();
     }
 
     public static PatternModel from(Pattern pattern) {