I am using Sitecore 8.2 update 5.
Now switching from Lucene Solr using the steps mentioned in: https://sitecorerockz.wordpress.com/2018/08/01/lucene-to-solr/
After doing all the changes when i tried to build the index the Index manager is empty as shown in this image Indixing manager
Below is the my all configuration using the .../sitecore/admin/showconfig.aspx
Link: https://gist.github.com/FirozNaimAnsari/45dce0167aa608b9e14a6815270709a9
In your config there is 1 index, a Lucene index, a custom one named mymywebsite_assets
Check if the following step is done correctly: Navigate to the website Include folder: wwwroot\{sitename}\App_Config\Include\ Enable the Sitecore.ContentSearch.Solr.*.config files by removing .example from the file name.
In your config I see currently only the "Sitecore.ContentSearch.Solr.DefaultIndexConfiguration.config"
Also on the doc.sitecore there is an walktrough specific to Sitecore 8.2 see https://doc.sitecore.com/developers/82/sitecore-experience-platform/en/walkthrough--setting-up-solr.html