added howtos to howto page

docs/manual/howtos/upload-promo.md

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+***How to upload a promo***:
+
+Audience: DJs
+
+Instructions:
+
+Record your promo and export it as a mp3
+
+note: if you can set the metadata of genre to **promo **you can skip the
+final step below
+
+Login to LibreTime with your DJ username
+
+Click Upload and drag or click and browse to upload the track.
+
+Let the track upload. Once it is done and is shown as imported on the
+right click **Tracks**
+
+Find the track in the list. *(follow instructions below if you don’t see
+it)*
+
+If it is not at the top click the **Uploaded **column until it sorts by
+the newest tracks first.
+
+If Uploaded doesn’t show up click **Columns **to the top right scroll
+down and click the box next to **Uploaded**
+
+****
+
+Now click **Uploaded **twice and it should display your track at the
+top.
+
+Click the box next your track and click the **Edit** button above the
+track listing.
+
+A box saying Editing “track name” should show up on the right.
+
+Find **Genre** type in **promo** (or whatever metadata classification
+your station uses)
+
+Scroll down and click **Save**
+
+If you match the metadata requirements for the station smart block then
+your track will be included in the track list it pulls from.