feat: add readme

README.md

@@ -1,2 +1,138 @@
 # noil
 
+**noil** is a structured, text-buffer-based file operation tool – think of it like [`oil.nvim`](https://github.com/stevearc/oil.nvim), but for any editor, terminal, or automated process.
+
+Edit filesystem operations like it's plain text, and then apply them in a controlled, explicit way.
+
+![demo](assets/demo.gif)
+
+---
+
+## ✨ Features
+
+* Edit your file tree like a normal buffer
+* Preview, format, and apply changes
+* Integrates with `$EDITOR`
+* CLI first, editor agnostic
+* No surprises: nothing is applied until you say so
+
+---
+
+## 🛠️ Usage
+
+### 1. Basic CLI
+
+```bash
+# Preview file tree and tags
+noil .
+
+# Edit in your $EDITOR
+noil edit .
+
+# Format an existing buffer (e.g. from within your editor)
+cat something.noil | noil fmt > something.noil
+
+# Apply changes from a buffer
+cat something.noil | noil apply
+```
+
+noil will always ask you if you want to apply your changes before doing any operations.
+
+---
+
+## ✍️ Syntax
+
+Each line follows this format:
+
+```
+<operation> <tag?> : <filepath>
+```
+
+### Supported operations:
+
+| Operation | Meaning                           | Tag Required? |
+| --------: | --------------------------------- | ------------- |
+|     `ADD` | Add new file                      | ❌ No          |
+|    `COPY` | Copy file with given tag          | ✅ Yes         |
+|  `DELETE` | Delete file with given tag        | ✅ Yes         |
+|    `MOVE` | Move file with given tag          | ✅ Yes         |
+| *(blank)* | Reference existing file (default) | ✅ Yes         |
+
+---
+
+### Example
+
+```
+         abc   :   /etc/nginx
+COPY     abc   :   /tmp/nginx-copy
+DELETE   123   :   /etc/nginx
+ADD            :   /new/file.txt
+```
+
+You can use short, unique tags (like `abc`, `ng1`, etc.) to refer to files. `noil` will generate these tags when you run `noil .`.
+
+---
+
+## 🧽 Formatting
+
+Want to clean up alignment and spacing?
+
+```bash
+cat my-buffer.noil | noil fmt
+```
+
+Or automatically format inside your editor with the following config for [Helix](https://helix-editor.com):
+
+```toml
+[[language]]
+name = "noil"
+scope = "source.noil"
+injection-regex = "noil"
+file-types = ["noil"]
+auto-format = true
+indent = { tab-width = 3, unit = "  " }
+formatter = { command = "noil", args = ["fmt"] }
+
+[[grammar]]
+name = "noil"
+source = { git = "https://git.front.kjuulh.io/kjuulh/tree-sitter-noil.git", rev = "2f295629439881d0b9e89108a1296881d0daf7b9" }
+```
+
+---
+
+## 🔒 Safety First
+
+No changes are ever made unless you explicitly apply them with:
+
+```bash
+# Closing the file, will trigger an apply, asking for prompt like normal
+noil edit .
+
+noil apply < my-buffer.noil
+```
+
+You will be prompted before anything is modified.
+
+---
+
+## 🧠 Philosophy
+
+noil gives you full control over file operations in a composable and editor-friendly way. Think Git index, but for actual file moves and deletions — human-editable, patchable, and grep-able.
+
+---
+
+## 📦 Installation
+
+**Build from source**:
+
+```bash
+cargo install --git https://git.front.kjuulh.io/kjuulh/noil.git
+```
+
+Or clone locally and run with `cargo run`.
+
+---
+
+## 📋 License
+
+MIT