Add release notes

Author: CrazyPython

RELEASE_NOTES.md

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+# Release notes
+
+## Since 0.0.1
+ - Added hyperlinked documentation on usage instructions for people new to the CLI
+ - Added missing source files, now it's possible to compile
+ - Support for starting queries with `{query:` was enabled
+ - Shows message when executed without a query
+
+## 0.0.1
+ - Supports `{and:`, `{or:`, `{not:`, nested arbitrarily, querying using page references
+ - Works on any kind of indentation, including tabs, spaces.
+   - Caveat: Mixing tabs and spaces in one file may lead to undesired results, because a tab is interpreted as one space
+ - Ignores text inside Markdown code blocks `\`\`\``
+   - Indentation is different for these code blocks. Searching with their text included as part of the parent block is not supported yet