packages,plugins: add package documentation

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/techdocs-common/src/index.ts

@@ -13,6 +13,13 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
+/**
+ * Common functionalities for TechDocs, to be shared between techdocs-backend plugin and techdocs-cli
+ *
+ * @packageDocumentation
+ */
+
 export * from './stages';
 export * from './helpers';
 export * from './techdocsTypes';