Add .gitattributes' and TODO' files.

.gitattributes

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+# See: https://axvr.io/projects/ascribe/
+*       text=auto eol=lf final-newline trim-trailing-whitespace
+*.vim   line-length=78 expand-tab tab-stop=4
+doc/*   line-length=78 expand-tab tab-stop=4
+*.md    line-length=80 expand-tab tab-stop=4

TODO

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+MAYBE:
+  - Better link syntax highlighting (more similar to links in vim-markdown)
+  - Syntax highlight bullets and checkboxes
+  - Option to enable/disable folding (similar to g:markdown_folding)
+  - Different syntax group for heading delimiters
+  - Change log in Vim doc
+
+UNLIKELY:
+  - Add working links
+    - Maybe utilise Vim-Waikiki and override default Vim mappings
+    - Open man pages (use ':h :Man')
+    - Add 'org-store-link' and 'org-insert-link' implementations
+  - Implement Emacs's abbreviations (e.g. '\<s<TAB>')