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

docs/development/project-setup/dependencies.md

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+## Project dependencies
+
+### Install Chatwoot Ruby dependencies
+
+Use the following command to install ruby dependencies.
+
+```bash
+bundle
+```
+
+### Install Chatwoot JavaScript dependencies
+
+```bash
+yarn
+```
+
+This would install all required dependencies for Chatwoot application.

docs/development/project-setup/environment-variables.md

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+## Environment variables
+
+### Setup environment variables
+
+Copy `database` and `application` variables to the correct location.
+
+```bash
+cp shared/config/database.yml config/database.yml
+cp shared/config/application.yml config/application.yml
+```
+
+### Configure database
+
+Use the following values in database.yml
+
+```bash
+development:
+  <<: *default
+  username: postgres
+  password:
+  database: chatwoot_dev
+```
+
+Following changes has to be in `config/application.yml`
+
+### Configure Pusher
+
+Chatwoot uses [Pusher](https://pusher.com/) to handle realtime messages. Create a free account on Pusher and fill the following environment values.
+
+```yml
+pusher_app_id: ''
+pusher_key: ''
+pusher_secret: ''
+pusher_cluster: ''
+```
+
+### Configure FB Channel
+
+To use FB Channel, you have to create an Facebook app in developer portal. You can find more details about creating FB channels [here](https://developers.facebook.com/docs/apps/#register)
+
+```yml
+fb_verify_token: ''
+fb_app_secret: ''
+fb_app_id: ''
+```
+
+### Configure emails
+
+For development, you don't need an email provider. Chatwoot uses [letter-opener](https://github.com/ryanb/letter_opener) gem to test emails locally
+
+### Configure frontend URL
+
+Provide the following value as frontend url
+
+```yml
+frontend_url: 'http://localhost:3000'
+```
+
+### Configure storage
+
+Chatwoot currently supports only S3 bucket as storage. You can read [Creating an S3 bucket](https://docs.aws.amazon.com/AmazonS3/latest/gsg/CreatingABucket.html) and [Create an IAM user](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_users_create.html) to configure the following details.
+
+```yml
+S3_BUCKET_NAME: ''
+AWS_ACCESS_KEY_ID: ''
+AWS_SECRET_ACCESS_KEY: ''
+AWS_REGION: ''
+```
+
+### Configure Redis URL
+
+For development, you can use the following url to connect to redis.
+
+```yml
+REDIS_URL: 'redis:://127.0.0.1:6379'
+```