New "hstr" plugin

diff --git a/plugins/hstr/README.md b/plugins/hstr/README.md
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+## hstr
+
+Integrate *hstr*, a "bash and zsh shell history suggest box", into ZSH.
+
+### Usage
+
+This plugin uses the "hstr --show-configuration" itself to enable *hstr*
+functionality in ZSH.
+at the time of this writing, April 22 2020 using *fzf* 2.2.0, this is
+
+1. set "histignorespace" shell option,
+2. add "hh" alias,
+3. add Keybindings.
+
+### Command Aliases
+
+- `hh`: `hstr`
+
+### Key Bindings
+
+- `CTRL-R`: Paste the selected command from history into the command line.

diff --git a/plugins/hstr/hstr.zshrc b/plugins/hstr/hstr.zshrc
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+# AX-ZSH: Alex' Modular ZSH Configuration
+# hstr.zshrc: Setup hstr
+
+axzsh_is_modern_terminal || return 91
+
+# Make sure that "hstr(1)" is installed
+(( $+commands[hstr] )) || return 1
+
+eval "$(hstr --show-configuration)"