Added commands file for creating a new user in ubuntu 16.04

Author: Benjamin

section9/lectures/135_want_to_deploy_to_aws/install.md renamed to section9/lectures/135_want_to_deploy_to_aws/commands.md

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+## Install PostreSQL on Ubuntu 16.04
+
+While logged in as root user:
+
+```bash
+apt-get update
+apt-get install postgresql postgresql-contrib
+```
+
+After installation, change user to postgres user by running
+```bash
+sudo -i -u postgres
+```
+
+Connect to the database by running
+
+```bash
+psql
+```
+
+To exit postgres database console, run
+
+```bash
+\q
+```
+
+To exit postgres user
+```bash
+exit
+```

section9/lectures/136_installing_postgreSQL_in_ubuntu_16/commands.md

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+## Create a user in Ubuntu 16.04
+To create a new user, run the following command and enter the user details as prompted (password, full name etc). Remember to replace "jose" with the name of your user.
+
+
+```bash
+adduser jose
+```
+
+# Add the new user to sudo users
+
+Running the visudo command will open a file (normally located at /etc/sudoers). 
+```bash
+visudo
+```
+
+Under "User privilege specification", add the following line below root line
+
+```bash
+jose ALL=(ALL:ALL) ALL
+```
+
+Save the file with CNTR+O and press enter to save it. Then CNTR+X to exit the file.
+
+# To enable logging in to the server as the newly created user, enable password login to the server by running
+
+```bash
+vi /etc/ssh/sshd_config
+```
+
+This opens another file. To disable root login with password, change the following line. Note you need to press "i" key to go to insert/edit mode before changing the contents of the file.
+
+```bash
+PermitRootLogin yes
+```
+
+to 
+
+```bash
+PermitRootLogin no
+```
+
+Scroll down to the end of the file and add the following line
+
+```bash
+AllowUsers jose
+```
+
+
+To exit edit/insert mode, press escape key then ":" followed by wq and press enter. "wq" writes the file to disc and quits the file.
+
+Finally, run
+
+```bash
+service sshd reload
+```
+
+