add a Todo file, ironically

Todo.md

@@ -0,0 +1,30 @@
+# To do
+
+* migrate this todo list into entomologist
+
+* teach it to work with a git branch
+    - unpack the branch to a directory with `git worktree ${TMPDIR} ${BRANCH}`
+    - operate on the issues in that worktree
+    - git commit the result back to ${BRANCH}
+    - delete and prune the worktree
+
+* implement `ent new`
+
+* implement user control over state transitions
+
+* implement `ent comment ${ISSUE} [-m ${MESSAGE}]`
+    - each issue dir has a `comments` subdir
+    - each comment is identified by a sha1-style uid
+    - each comment is a file or directory under the `${ISSUE}/comments`
+    - comments are ordered by ctime?
+
+* implement `ent edit ${ISSUE} [-t ${TITLE}] [-d ${DESCRIPTION}]`
+    - or would it be better to put the title and description together into a new `message`, like git commits?
+
+* implement `ent edit ${COMMENT}`
+
+* implement `ent attach ${ISSUE} ${FILE}`
+    - each issue has its own independent namespace for attached files
+    - issue description & comments can reference attached files via standard md links
+
+* write a manpage