ft: readme + instructions

README.md

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+# Tum(bler del)eter
+
+Python script that uses the Tumblr API to remove all "empty reblogs" for a tumblr account's main blog.
+
+Empty reblogs are defined as posts on the account where both of the following hold:
+1) the last addition in the reblog trail is NOT made by the account.
+2) the account did not add any tags.
+
+# Running
+
+You're going to need to get authentication for the Tumblr API.
+First set up an [application](https://www.tumblr.com/oauth/apps).
+
+Then copy the `env.example` file to `.env` and populate the four required values.
+After that just run the program using `uv run main.py` and give it time to run.
+
+# Rate limits
+
+Tumblr's API has hard-coded rate limits, so the script will wait on timeout and try again at a later point.
+Note that as a result, running the script may take a while (especially on blogs with a large number of posts).
+