add missing src/string-content-entry.mjs from template

src/string-content-entry.mjs

@@ -0,0 +1,41 @@
+import { StringContentEntryMixin } from "./string-content-entry-mixin.mjs";
+import { ContentEntry } from "./content-entry.mjs";
+
+/**
+ * Content entries where a string is the primary data representation.
+ *
+ * @param {string} name
+ * @param {string} value
+ *
+ * @property {string} name
+ * @property {string} string
+ */
+export class StringContentEntry extends StringContentEntryMixin(ContentEntry) {
+
+
+  // @ts-ignore
+  /** @type {string} */ string;
+
+  /**
+   * Content entries where a string is the primary data representation.
+   *
+   * @param {string} name
+   * @param {string} value
+   *
+   * @property {string} name
+   * @property {string} string
+   */
+  constructor(name, value) {
+    // @ts-ignore
+    super(name);
+    this.string = value;
+  }
+
+  /**
+   *
+   * @returns {boolean} true if string length is zero
+   */
+  get isEmpty() {
+    return this.string.length === 0;
+  }
+}