Add TODO.md

TODO.md

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+# TODO
+
+## API for blocks
+
+### POST /api/block/append
+
+`block=<block>&text=<text>`
+
+Append `<text>` as a new block at the end of the children `<block>`.
+
+## Tables
+
+A table can be defined by headers and rows. The headers are the `Keywords::` of
+the page, and the rows are the pages where these fields should be taken from.
+
+```text
+{{table}}
+    headers
+        Father
+        Title
+    rows
+        [[Link to other page]]
+        ...
+```
+
+### Use cases
+
+#### Show the values from the pages in a table form based on the header names
+
+#### Edit the values and update the name/value pair in the corresponding document