Add bash line editor.

.local/share/doc/blesh/contrib/prompt.md

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+# ⚙ Prompt sequences
+
+## :pencil: `contrib/prompt-vim-mode`
+
+Source: [`prompt-vim-mode.bash`](https://github.com/akinomyoga/blesh-contrib/blob/master/prompt-vim-mode.bash)
+
+### Prompt sequence `\q{contrib/vim-mode}`
+
+This prompt sequence expands to the vim mode name.
+
+```bash
+# blerc (example)
+
+ble-import contrib/prompt-vim-mode
+PS1='[\u@\h \W]\q{contrib/vim-mode}\$ ' # show mode name in PS1
+bleopt keymap_vi_mode_show:=            # hide mode line
+```
+
+## :pencil: `contrib/prompt-git`
+
+Source: [`prompt-git.bash`](https://github.com/akinomyoga/blesh-contrib/blob/master/prompt-git.bash)
+
+```bash
+# blerc (example)
+
+ble-import contrib/prompt-git
+bleopt prompt_rps1='\q{contrib/git-info}'
+```
+
+### Prompt sequence `\q{contrib/git-info}`
+
+This expands to a string that explains the current git status.
+
+### Prompt sequence `\q{contrib/git-name}`
+
+This expands to the directory name of the repository.
+
+### Prompt sequence `\q{contrib/git-hash N}`
+
+This expands to the commit hash.
+The hash is truncated to the length `N`.
+The default value for `N` is `7`.
+
+### Prompt sequence `\q{contrib/git-branch}`
+
+This expands to the branch name (or tag name or hash) of `HEAD`.
+
+### Prompt sequence `\q{contrib/git-path}`
+
+This expands to the current path relative to the root directory of the repository.
+
+## :pencil: `contrib/prompt-elapsed`
+
+Source: [`prompt-elapsed.bash`](https://github.com/akinomyoga/blesh-contrib/blob/master/prompt-elapsed.bash)
+
+Measures the time of the previous command execution.
+
+```bash
+# blerc (example)
+
+ble-import contrib/prompt-elapsed
+bleopt prompt_rps1='\g{fg=69,italic}\q{contrib/elapsed}'
+```
+
+### Prompt sequence `\q{contrib/elapsed}`
+
+This expands to the high-resolution elapsed time for the command execution.
+
+### Prompt sequence `\q{contrib/elapsed-real}`
+
+This expands to the `real` time of `time`.
+
+### Prompt sequence `\q{contrib/elapsed-user}`
+
+This expands to the `user` time of `time`.
+
+### Prompt sequence `\q{contrib/elapsed-sys}`
+
+This expands to the `sys` time of `time`.
+
+### Prompt sequence `\q{contrib/elapsed-cpu}`
+
+This expands to the average cpu usage.