feat(sdkman): add basic initialization for sdkman

plugins/sdkman/README.md

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+# sdkman
+
+Plugin for SDKMAN, a tool for managing parallel versions of multiple Software Development Kits on most Unix based systems.
+Provides initialization for different scenarios where users may have installed.
+
+To use it, add `sdkman` to your plugins array in your zshrc file:
+
+```zsh
+plugins=(... sdkman)
+```
+
+## Requirements
+
+* [SDKMAN](http://sdkman.io/)

plugins/sdkman/sdkman.plugin.zsh

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+if [[ -z "$SDKMAN_DIR" ]]; then
+  if [[ -d "$HOME/.sdkman" ]]; then
+    export SDKMAN_DIR="$HOME/.sdkman"
+  else
+    export SDKMAN_DIR="$(brew --prefix sdkman-cli)/libexec" || echo "Cannot find SDKMAN!"
+  fi
+fi
+[[ -s "${SDKMAN_DIR}/bin/sdkman-init.sh" ]] && source "${SDKMAN_DIR}/bin/sdkman-init.sh"