plugins: added nvm and sdkman (#150)

* feat(plugins): added sdkman plugin

* feat(plugins): added nvm plugin

* fix: fixed the codacy issues

plugins/nvm/README.md

+# nvm plugin
+
+This plugin automatically source nvm[1]
+
+## Installation
+
+### Install nvm
+
+Lets install[2] the nvm without updaing shell config!
+
+```bash
+export NVM_DIR="$HOME/.nvm" && (
+  git clone https://github.com/nvm-sh/nvm.git "$NVM_DIR"
+  cd "$NVM_DIR"
+  git checkout `git describe --abbrev=0 --tags --match "v[0-9]*" $(git rev-list --tags --max-count=1)`
+) && \. "$NVM_DIR/nvm.sh"
+```
+
+### Include nvm as plugin
+
+```bash
+plugins=(
+  git
+  nvm
+)
+```
+
+## nvm completion configuration
+
+```bash
+completions=(
+  git
+  composer
+  ssh
+  nvm
+)
+```
+
+[1]: https://github.com/nvm-sh/nvm
+[2]: https://github.com/nvm-sh/nvm#manual-install

plugins/nvm/nvm.plugin.sh

+#!/usr/bin/env bash
+
+# Set NVM_DIR if it isn't already defined
+[[ -z "$NVM_DIR" ]] && export NVM_DIR="$HOME/.nvm"
+
+
+# Try to load nvm only if command not already available
+if ! type "nvm" &> /dev/null; then
+  [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
+  # This is done as part of completions!!!
+  # [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
+fi

plugins/sdkman/README.md

+# sdkman plugin
+
+This plugin automatically source sdkman[1]
+
+## Installation
+
+### Install sdkman
+
+Lets install[2] the sdkman without updaing shell config!
+
+```bash
+$ curl -s "https://get.sdkman.io?rcupdate=false" | bash
+```
+
+### Include sdkman as plugin
+
+```bash
+plugins=(
+  git
+  sdkman
+)
+```
+
+[1]: https://sdkman.io/
+[2]: https://sdkman.io/install

plugins/sdkman/sdkman.plugin.sh

+#!/usr/bin/env bash
+
+# Set NVM_DIR if it isn't already defined
+[[ -z "$SDKMAN_DIR" ]] && export NVM_DIR="$HOME/.sdkman"
+
+# Try to load sdk only if command not already available
+if ! type "sdk" &> /dev/null; then
+  [[ -s "$HOME/.sdkman/bin/sdkman-init.sh" ]] && source "$HOME/.sdkman/bin/sdkman-init.sh"
+fi