docs: Restructure docs, move the files to their relevant location. (#3648)

Also combines windows TLS docs with single doc with Linux.

docs/service/linux/README.md

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+# Running Minio as a service on Linux
+
+## Install Minio service
+
+Systemctl is a controller for systemd system and service manager. This document assumes operating system to be Ubuntu 16.04 (LTS) with `systemctl`.
+
+Create a default minio startup config file at `/etc/default/minio`. `MINIO_VOLUMES` should be updated with the correct path.
+```
+cat <<EOT >> /etc/default/minio
+# Local export path.
+MINIO_VOLUMES="/mnt/export"
+# Use if you want to run Minio on a custom port.
+# MINIO_OPTS="--address :9001"
+
+EOT
+```
+
+Optionally you can also override your Minio access credentials as shown below.
+```
+cat <<EOT >> /etc/default/minio
+# Access key of the server.
+MINIO_ACCESS_KEY=YOUR-ACCESSKEY
+# Secret key of the server.
+MINIO_SECRET_KEY=YOUR-SECRETKEY
+
+EOT
+```
+
+Download `minio.service` into  `/etc/systemd/system/`
+```
+( cd /etc/systemd/system/; curl -O https://raw.githubusercontent.com/minio/minio-systemd/master/minio.service )
+```
+
+## Enable Minio service
+
+Once we have successfully copied the `minio.service` we will enable it to start on boot.
+```
+systemctl enable minio.service
+```
+
+## Disable Minio service
+```
+systemctl disable minio.service
+```

docs/service/windows/README.md

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+# Running Minio as a service on Windows
+
+## Install Minio service
+
+NSSM is an opensource alternative to srvany. NSSM is still being updated, and works on Windows 10 as well.
+
+Download [NSSM](http://nssm.cc/download) and extract the 64 bit nssm.exe to a known path.
+
+```
+c:\nssm.exe install Minio c:\bin\minio.exe server c:\data
+```
+
+### Configure startup type
+
+When you start services, look for the Minio service and start and stop (or make it automatically start at reboots) the service.
+
+![Configure startup type](https://raw.githubusercontent.com/minio/minio/master/docs/screenshots/windows-configure-startup-type.png)
+
+### Configure user
+
+It is a good (and secure) practice to create a new user, assign rights to the data folder to this user and change the service Log On info to use the newly created user.
+
+![Configure user](https://raw.githubusercontent.com/minio/minio/master/docs/screenshots/windows-configure-user.png)
+
+## Delete Minio service
+```
+c:\nssm.exe remove Minio
+```