Populate README, add poetry.lock

README.md

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 # mirro
+
+**mirro** is a tiny safety-first editing wrapper for text files.
+You edit a temporary file, **mirro** detects whether anything changed, and if it did, it saves a backup of the original before writing your changes.
+
+
+## Why mirro?
+
+Well... have you ever been in the _“ugh, I forgot to back this up first”_ situation? 
+
+No?
+
+Stop lying... (:))
+
+**mirro** gives you a built-in safety net:
+
+- never edits the real file directly
+
+- detects whether the edit actually changed content
+
+- creates a timestamped backup only when changes occurred
+
+- clearly labels backups so you know exactly what they came from
+
+- respects the user’s `$EDITOR` when possible
+
+- requires `sudo` only when actually needed
+
+It’s simple, predictable, and hard to misuse.
+
+I mean... the only thing you need to remember is _to use it_.
+
+## How it works
+
+**mirro** reads the original file (or pre-populates new files with a friendly message).
+
+It writes that content into a temporary file.
+
+It launches your `$EDITOR` to edit the temp file.
+
+When the editor closes, **mirro** compares old vs new.
+
+If nothing changed:
+```
+file hasn't changed
+```
+
+If changed:
+```
+file changed; original backed up at: ~/.local/share/mirro/ (or /root/.local/share/mirro/ under sudo)
+```
+
+Backed up files include a header:
+```
+# ---------------------------------------------
+# mirro backup
+# Original file: /path/to/whatever.conf
+# Timestamp: 2025-11-10 17:44:00 UTC
+# ---------------------------------------------
+```
+
+So you never lose track of the original location.
+
+### Backup directory
+
+By default all the backups will be stored at:
+```
+~/.local/share/mirro/
+```
+so under `sudo`:
+```
+/root/.local/share/mirro/
+```
+
+Backups are named like:
+```
+filename.ext.orig.20251110T174400.bak
+```
+
+## Installation
+
+**NOTE**: To use mirro with sudo, the path to mirro must be in the $PATH seen by root.
+Either install mirro as root (preferred), use sudo -E mirro, or add the $PATH to /etc/sudoers using its Defaults secure_path parameter.
+
+Install via PyPI (preferred):
+```
+pip install mirro
+```
+
+Or clone the repo and install locally:
+```
+git clone https://github.com/mdaleo404/mirro.git
+cd mirro/
+poetry install
+```