readme: Add readme

README.md

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+# mklni - Chroot helper for makelni
+
+## Installation
+1. Create a new directory
+2. Download [mklni](https://git.timoxa0.su/timoxa0/mklni/src/branch/main/mklni.sh) in that directory
+3. Allow executing mklin ```chmod +x mklni```
+4. Install chroot ```sudo ./mklni install```
+
+## Usage
+- Setup build chroot ```sudo ./mklni install```
+
+- Remove build chroot ```sudo ./mklni uninstall```
+
+- Make image ```sudo ./mklni build path/to/lnibuild```. Image will be created in same directory
+
+- Clean raw images ```sudo ./mklni -r or --cleanraw```
+
+- Clean build chroots ```sudo ./mklni -c or --cleanup```
+
+- Chroot into ```sudo ./mklni chroot```