[tracker/sam/readme-updates: 1/3] README: Prominently mention the two different tracker repos

[Sam Thursfield <sthursfield src gnome org>]

commit dcc1509cdc0948691f86fb48b7c1dfc493d122b0
Author: Sam Thursfield <sam afuera me uk>
Date:   Mon May 20 22:35:20 2019 +0200

    README: Prominently mention the two different tracker repos
    
    Let's do our best to avoid confusion.
    
    Also link to gnome-online-miners.

 README.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
---
diff --git a/README.md b/README.md
index bdcf9c656..04ae84e84 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,16 @@
 
 Tracker is a search engine for desktop and mobile.
 
+The Tracker project is divided into two main repositories:
+
+  * [Tracker core](https://gitlab.gnome.org/GNOME/tracker) contains the database
+    (*tracker-store*), the database ontologies, the commandline user
+    interface (`tracker`), and several support libraries.
+
+  * [Tracker Miners](https://gitlab.gnome.org/GNOME/tracker-miners) contains
+    the indexer daemon (*tracker-miner-fs*) and tools to extract metadata
+    from many different filetypes.
+
 More information on Tracker can be found at:
 
   * <https://wiki.gnome.org/Projects/Tracker>
@@ -18,6 +28,12 @@ IRC channel #tracker on:
 
   * [irc.gimp.net](irc://irc.gimp.net)
 
+Related projects:
+
+  * [GNOME Online Miners](https://gitlab.gnome.org/GNOME/gnome-online-miners/)
+    extends Tracker to allow searching and indexing some kinds of online
+    content.
+
 ## Compilation
 
 To setup the project for compilation after checking it out from