add README and comments

README.md

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+### Use SDKMan to install development tools
+```
+curl -s "https://get.sdkman.io" | bash
+sdk install java
+sdk install gradle
+sdk install java 8.0.202-zulu
+```
+
+### Download docker
+`curl -o docker.dmg -sL https://download.docker.com/mac/stable/Docker.dmg`
+
+### Install dependencies with Brew
+`brew bundle`
+
+### Install Oh My Zsh
+```
+sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"
+git clone https://github.com/bhilburn/powerlevel9k.git ~/.oh-my-zsh/custom/themes/powerlevel9
+gsed  's#ZSH_THEME="robbyrussell"#ZSH_THEME="powerlevel9k/powerlevel9k"#g' -i ~/.zshrc
+```
+
+### install Meslo font 
+Get it from `https://github.com/powerline/fonts/blob/master/Meslo%20Slashed/Meslo%20LG%20M%20Regular%20for%20Powerline.ttf` and configure it as default in iTerm2 Set this font in iTerm2 (14px is my personal preference) (iTerm → Preferences → Profiles → Text → Change Font).
+
+### OSX Defaults
+```
+defaults write http://com.apple .screencapture location ~/Download
+#defaults write com.apple.PowerChime ChimeOnNoHardware -bool true # still KO after closing lid
+#killall PowerChime
+```
+
+### Install NPM dependencies
+`npm install -g jira-node-cli`

private_dot_ssh/config

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+# Needed for https://stackoverflow.com/questions/27566999/git-with-intellij-idea-could-not-read-from-remote-repository 
 Host *
  AddKeysToAgent yes
  UseKeychain yes