Add .cypher icon, file template and type

editor-plugin/intellij/src/main/java/org/neo4j/intellij/lsp/language/CypherFileType.java

@@ -0,0 +1,41 @@
+package org.neo4j.intellij.lsp.language;
+
+import com.intellij.openapi.fileTypes.LanguageFileType;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import javax.swing.*;
+
+public final class CypherFileType extends LanguageFileType {
+
+  public static final CypherFileType INSTANCE = new CypherFileType();
+
+  private CypherFileType() {
+    super(CypherLanguage.INSTANCE);
+  }
+
+  @NotNull
+  @Override
+  public String getName() {
+    return "Cypher File";
+  }
+
+  @NotNull
+  @Override
+  public String getDescription() {
+    return "Cypher language file";
+  }
+
+  @NotNull
+  @Override
+  public String getDefaultExtension() {
+    return "cypher";
+  }
+
+  @Nullable
+  @Override
+  public Icon getIcon() {
+    return CypherIcons.FILE;
+  }
+
+}

editor-plugin/intellij/src/main/java/org/neo4j/intellij/lsp/language/CypherIcons.java

@@ -0,0 +1,10 @@
+package org.neo4j.intellij.lsp.language;
+
+import com.intellij.openapi.util.IconLoader;
+
+import javax.swing.*;
+
+public class CypherIcons {
+    /* File icon - 16x16 pixels - displayed next to the file name on the file tab */
+    public static final Icon FILE = IconLoader.getIcon("META-INF/fileIcon.svg", CypherIcons.class);
+}

editor-plugin/intellij/src/main/java/org/neo4j/intellij/lsp/language/CypherLanguage.java

@@ -0,0 +1,11 @@
+package org.neo4j.intellij.lsp.language;
+
+import com.intellij.lang.Language;
+
+public class CypherLanguage extends Language {
+
+    public static final CypherLanguage INSTANCE = new CypherLanguage();
+    private CypherLanguage() {
+        super("Cypher");
+    }
+}

editor-plugin/intellij/src/main/resources/META-INF/plugin.xml

@@ -17,5 +17,11 @@
     <extensions defaultExtensionNs="com.intellij">
         <platform.lsp.serverSupportProvider
                 implementation="org.neo4j.intellij.lsp.cypherlspsupport.CypherLspServerSupportProvider"/>
+        <fileType
+                name="Cypher File"
+                implementationClass="org.neo4j.intellij.lsp.language.CypherFileType"
+                fieldName="INSTANCE"
+                language="Cypher"
+                extensions="cypher"/>
     </extensions>
 </idea-plugin>