Add check-lines-alignment documentation

.README/rules/check-lines-alignment.md

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+### `check-alignment`
+
+Reports invalid alignment of JSDoc block lines.
+
+|||
+|---|---|
+|Context|everywhere|
+|Tags|`param`, `arg`, `argument`, `property`, `prop`|
+
+The following patterns are considered problems:
+
+````js
+/**
+ * Function description.
+ *
+ * @param {string} lorem Description.
+ * @param {int} sit Description multi words.
+ */
+const fn = ( lorem, sit ) => {}
+// Message: Expected JSDoc block lines to be aligned.
+
+/**
+ * My object.
+ *
+ * @typedef {Object} MyObject
+ *
+ * @property {string} lorem Description.
+ * @property {int} sit Description multi words.
+ */
+// Message: Expected JSDoc block lines to be aligned.
+
+The following patterns are not considered problems:
+
+````js
+/**
+ * Function description.
+ *
+ * @param {string} lorem Description.
+ * @param {int}    sit   Description multi words.
+ */
+const fn = ( lorem, sit ) => {}
+
+/**
+ * My object.
+ *
+ * @typedef {Object} MyObject
+ *
+ * @property {string} lorem Description.
+ * @property {int}    sit   Description multi words.
+ */
+````