Add readme files to some directories

notebook/Linux/Tools/Readme.md

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+# Linux Tools
+A collection of tools that are too Linux-Specific to end up in the /Tools category.

notebook/Readme.md

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+# Notebook
+My personal public notebook. This is where I keep track of stuff that might be of use to other people around the world.
+
+I use [[Obsidian]] to write and manage this Notebook, which uses markdown files in a directory hierarchy.

notebook/Tools/Readme.md

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+# Tools
+This is a list of tools I use or have used.