Created How to keep track of important items (markdown)

How-to-keep-track-of-important-items.md

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+In some stories, important items pivotal to the story plot must be tracked.
+
+**Examples:** (source: [@jimkricket](https://github.com/jimkricket) in [#201](https://github.com/olivierkes/manuskript/issues/201#issue-271535489))
+
+- Couple examples from King Arthur include: Excalibur & The Holy Grail.
+
+- Example from Lord of the Rings: One Ring.
+
+- Miscellaneous applications: A Locket the protagonist had as a baby, a magical jewel found in a dungeon, a smartphone owned by the protagonist, personal spacecraft bestowed to a captain.
+
+
+# Create your items in the World tab
+
+Go to the **World** tab, and create your items. (Here the list is populated with the default "Fantasy World Building".)
+
+![image](https://user-images.githubusercontent.com/1192933/32453521-b47bde8c-c31c-11e7-979a-d70dfaca4300.png)
+
+In the description, you can insert references to characters or any other things. Insert references with `CTRL+Space`.
+
+# References your items in your scenes
+
+Items can be referenced in the Editor in the **Notes / References** Metadata block: (right-click, or `CTRL+Space` to insert reference).
+
+![image](https://user-images.githubusercontent.com/1192933/32453668-3c67a7f4-c31d-11e7-9bcd-f54930191d31.png)
+
+# Get an overview with the Cheat sheet:
+
+Now if you look in the **Cheat sheet**, you'll see all the places the object appears in:
+
+![image](https://user-images.githubusercontent.com/1192933/32453875-ce253fe4-c31d-11e7-9441-1a74bb54fd19.png)
+
+# Get an overview with the Story line:
+
+And finally, it *should* appear in the **story line**, but that's not implemented yet (only *characters* and *plot* appear for now). Soon.