docs: add help file (#80)

* docs: describe behavior

* docs: add help

close #26

Release-As: 1.0.0

Author: Omochice

README.md

@@ -1,10 +1,29 @@
+# vim-textobj-bettertag
+
 [![vim-themis](https://github.com/Omochice/vim-textobj-bettertag/actions/workflows/ci.yml/badge.svg)](https://github.com/Omochice/vim-textobj-bettertag/actions/workflows/ci.yml)
 
-# vim-textobj-bettertag
+This plugin provides a mapping: `<Plug>(textobj-bettertag-i)`.
+
+If you place the cursor on `|` position.
 
+```html
+<div>
+| some text
+</div>
+```
 
-This plugin provide mapping: `<Plug>(textobj-bettertag-i)`.
+When you run `dit` you will get the following:
 
+```html
+<div>|</div>
+```
+
+If you map this plugin as `onoremap it <Plug>(textobj-bettertag-i)`, you will get:
+
+```html
+<div>
+|</div>
+```
 
 ## Coverage
 
@@ -15,6 +34,6 @@ Currently, there are tested on Linux only.
 |stable |[![coverage-vim-stable](https://omochice.github.io/vim-textobj-bettertag/badge-Linux-vim-stable.svg)](https://github.com/Omochice/vim-textobj-bettertag/actions/workflows/ci.yml)|[![coverage-nvim-stable](https://omochice.github.io/vim-textobj-bettertag/badge-Linux-neovim-stable.svg)](https://github.com/Omochice/vim-textobj-bettertag/actions/workflows/ci.yml)|
 |nightly|[![coverage-vim-nightly](https://omochice.github.io/vim-textobj-bettertag/badge-Linux-vim-nightly.svg)](https://github.com/Omochice/vim-textobj-bettertag/actions/workflows/ci.yml)|[![coverage-nvim-nightly](https://omochice.github.io/vim-textobj-bettertag/badge-Linux-neovim-nightly.svg)](https://github.com/Omochice/vim-textobj-bettertag/actions/workflows/ci.yml)|
 
+## License
 
-
-
+[zlib](./LICENSE)

doc/vim-textobj-bettertag.txt

@@ -0,0 +1,30 @@
+*vim-textobj-bettertag.txt*           tag textobj without beginning of newline
+
+==============================================================================
+vim-textobj-bettertag ~
+                                                       *vim-textobj-bettertag*
+
+- Dependencies	|vim-textobj-bettertag-dependencies|
+- Interface	|vim-textobj-bettertag-interface|
+
+------------------------------------------------------------------------------
+Dependencies ~
+                                          *vim-textobj-bettertag-dependencies*
+This plugin needs:
+
+- https://github.com/kana/vim-textobj-user
+
+------------------------------------------------------------------------------
+Interface                                   *vim-textobj-bettertag-interface*
+
+This plugin provides `<Plug>(textobj-bettertag-i)` only.
+
+You can map this as instead of `it`:
+
+>vim
+	xnoremap it <Plug>(textobj-bettertag-i)
+	onoremap it <Plug>(textobj-bettertag-i)
+<
+
+==============================================================================
+vim:tw=78:ts=8:ft=help:norl:et:fen:fdl=0: