Offline KB - Added README and a simple download script to download a subset of the smaller, topic-specific exports of wikipedia

overlay/etc/skel/wikipedia/README.md

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+# Offline Knowledge Bases
+
+There are several offline repositories that are made freely available
+using a `.zim` file. Depending on the resource, they can be quite large.
+EmComm Tools Community includes an offline reader called "Kiwix" for 
+searching and reading these resources offline.
+
+1. Visit: http://download.kiwix.org/zim/wikipedia/
+
+2. To save space when building your image, consider some of the smaller
+   Wikipedia topic areas, such as:
+
+   * `wikipedia_en_computer_nopic_YYYY-MM.zim`
+   * `wikipedia_en_history_nopic_YYYY-MM.zim`
+   * `wikipedia_en_mathematics_nopic_YYYY-MM.zim`
+   * `wikipedia_en_medicine_nopic_2024-04.zim`
+   * `wikipedia_en_simple_all_nopic_YYYY-MM.zim`
+
+   The full Wikipedia export without images is 56 GB. This file is better
+   stored separately and excluded from the ETC ISO build image.
+
+3. Copy these `.zim` file to `/etc/skel/wikipedia` during the image build.
+
+4. Other high-value offline exports to look into are available at:
+
+   * https://download.kiwix.org/zim/ifixit/
+
+5. Run `kiwix` after a fresh installation. Your .zim files will
+   be available in your home directory in the `wikipedia` folder.
+