Add plugin for hstr

plugins/hstr/README.md

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+# hstr plugin
+
+This is a helper plugin for https://github.com/dvorka/hstr
+
+Includes necessary aliases and key bindings for hstr in ZSH.

plugins/hstr/hstr.plugin.zsh

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+alias hh=hstr                    # hh to be alias for hstr
+export HISTFILE=~/.zsh_history  # ensure history file visibility
+export HSTR_CONFIG=hicolor        # get more colors
+bindkey -s "\C-r" "\eqhstr\n"     # bind hstr to Ctrl-r (for Vi mode check doc)