Add development docs

docs/development/environment-setup/ubuntu.md

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+## Setting up development environment in Ubuntu
+
+Open a terminal and run the following commands
+
+```bash
+sudo apt-get update
+```
+
+### Install Git
+
+```bash
+sudo apt-get install git
+```
+
+### Install RVM
+
+You need software-properties-common installed in order to add PPA repositories.
+
+```bash
+sudo apt-get install software-properties-common
+```
+
+```bash
+sudo apt-add-repository -y ppa:rael-gc/rvm
+sudo apt-get update
+sudo apt-get install rvm
+```
+
+Enable `Run command as a login shell` in terminal `Preferences`. Restart your computer
+
+### Install Ruby
+
+Chatwoot APIs are built on Ruby on Rails, you need install ruby 2.6.3
+
+```bash
+rvm install ruby-2.6.3
+```
+
+Use ruby 2.6.3 as default
+
+```bash
+rvm use 2.6.3 --default
+```
+
+### Install Node.js
+
+Install Node.js from NodeSoure using the following commands
+
+```bash
+curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -
+sudo apt-get install -y nodejs
+```
+
+### Install yarn
+
+We use `yarn` as package manager
+
+```bash
+curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
+echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
+```
+
+```bash
+sudo apt-get update && sudo apt-get install yarn
+```
+
+### Install postgres
+
+The database used in Chatwoot is PostgreSQL. Use the following commands to install postgres.
+
+```bash
+sudo apt install postgresql postgresql-contrib
+```
+
+The installation procedure created a user account called postgres that is associated with the default Postgres role. In order to use Postgres, you can log into that account.
+
+```bash
+sudo -u postgres psql
+```
+
+Install `libpg-dev` dependencies for ubuntu
+
+```bash
+sudo apt-get install libpq-dev
+```
+
+### Install redis-server
+
+Chatwoot uses Redis server in agent assignments and reporting. To install `redis-server`
+
+```bash
+sudo apt-get install redis-server
+```
+
+Enable Redis to start on system boot.
+
+```bash
+sudo systemctl enable redis-server.service
+```
+
+### Install imagemagick
+
+```bash
+sudo apt-get install imagemagick
+```
+
+Next: Read project setup to install project dependencies