Add documentation to troubleshoot platform installation (#675)

Author: Tarun-Arora

install/installation.md

@@ -90,6 +90,12 @@ sudo apt-get install libfftw3-dev
 sudo apt-get install libsndfile1-dev
 ```
 
+* If any issue still persists, follow the mentioned steps to debug and troubleshoot your issue:
+    1. Firstly check the Platform Installation log file in the install folder. Check for any errors, which may have been caused during platform installation on your system, and then try to resolve them accordingly.
+    2. Next check for nginx status by `service nginx status` command, if it is not active, check nginx error log file, possibly in `/var/log/nginx/error.log` file.
+    3. Next check for platform status by `service platform status` command, if it is not `active(running)` then check for platform logs in the `logs` directory of your project.
+    4. In case of any gunicorn error try manually running `/etc/init.d/platform start` command and recheck the platform status.
+
 ## Nginx configuration for X-Accel-Redirect
 
 To serve files without any scripting language overhead, the X-Accel-Redirect