Add readme

README.md

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+# today
+
+## Goal 1
+
+- Support simple dates and optional times
+- Support tasks, notes and birthdays
+
+```
+TASK Task without date
+DONE (2021-10-27 00:50)
+
+TASK Another simple task
+DONE
+
+TASK Another task, this time with date
+DATE 2021-10-26
+DONE 2021-10-26 (2021-10-27 00:52)
+
+NOTE Maybe an appointment
+DATE 2021-12-07 16:00
+    Here are some notes regarding the appointment
+    Notes can be multiple lines long
+
+    Including empty lines (not even whitespace) in-between
+    As long as the text stays indented, it's still part of it
+
+BIRTHDAY John Doe (<age>)
+DATE 1987-05-12
+
+BIRTHDAY Jane Doe
+DATE ?-08-22
+DONE 2021-08-22 (2021-08-22 10:23)
+```