Adding Column-DBs content (#1323)

* add column-db content

* Add content to Build-Tools

* Update content/roadmaps/101-backend/content/107-nosql-databases/101-column-databases.md

* Update content/roadmaps/100-frontend/content/110-build-tools/readme.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/100-frontend/content/110-build-tools/readme.md

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-# Build tools
+# Build Tools
+
+Task runners automatically execute commands and carry out processes behind the scenes. This helps automate your workflow by performing mundane, repetitive tasks that you would otherwise waste an egregious amount of time repeating yourself.
+
+Common usages of task runners include numerous development tasks such as: spinning up development servers, compiling code (ex. SCSS to CSS), running linters, serving files up from a local port on your computer, and many more! 

content/roadmaps/101-backend/content/107-nosql-databases/101-column-databases.md

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-# Column databases
+# Column Databases
+
+A **<u>columnar database</u>** is a database management system (DBMS) that stores data in columns as opposed to rows. The main advantage of columnar databases over row-oriented ones is their **<u>faster performance</u>**; this is due in large part to them accessing less memory to output data. This column structure can store more data in a smaller amount of memory. And because the initial data retrieval is done on a column-by-column basis, only the columns that need to be used are retrieved. This grants columnar databases like **Cassandra DB** their ability to scale efficiently and handle large amounts of data.