docs(id): add book, cast, and course (#6218)

* docs(id): add book, cast, and course

* docs(fix): readjust space

* docs: add solidity index

* docs: fix missing line

* Update courses/free-courses-id.md

Co-authored-by: ImVector <59611597+LuigiImVector@users.noreply.github.com>

* Update books/free-programming-books-id.md

Co-authored-by: ImVector <59611597+LuigiImVector@users.noreply.github.com>

* Update courses/free-courses-id.md

Co-authored-by: ImVector <59611597+LuigiImVector@users.noreply.github.com>

* Update books/free-programming-books-id.md

Co-authored-by: ImVector <59611597+LuigiImVector@users.noreply.github.com>

* Update casts/free-podcasts-screencasts-id.md

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

* Update books/free-programming-books-id.md

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

Co-authored-by: ImVector <59611597+LuigiImVector@users.noreply.github.com>
Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

books/free-programming-books-id.md

@@ -18,6 +18,7 @@
 * [PHP](#php)
 * [Python](#python)
 * [React](#react)
+* [Solidity](#solidity)
 * [TypeScript](#typescript)
   * [Angular](#angular)
   * [Deno](#deno)
@@ -153,6 +154,11 @@
 * [React JS Untuk Pemula](https://masputih.com/2021/05/ebook-gratis-reactjs-untuk-pemula) *(Membutuhkan akun Leanpub atau email yang valid)*
 
 
+### Solidity
+
+* [Smart Contract Blockchain pada E-Voting](https://www.researchgate.net/publication/337961765_Smart_Contract_Blockchain_pada_E-Voting) - Ajib Susanto (HTML, PDF)
+
+
 ### TypeScript
 
 * [Belajar TypeScript](https://leanpub.com/belajar-typescript) *(Membutuhkan akun Leanpub atau email yang valid)*

casts/free-podcasts-screencasts-id.md

@@ -1,3 +1,4 @@
 ### Podcast
 
 * [Ceritanya Developer Podcast](https://anchor.fm/ceritanya-developer) (Podcast)
+* [Devmuslim Podcast](https://anchor.fm/devmuslimid) (Podcast)

courses/free-courses-id.md

@@ -353,6 +353,7 @@
 ### Solidity
 
 * [Ethereum Blockchain Tutorial Bahasa Indonesia](https://www.youtube.com/playlist?list=PLNl8QwXqW_lvWSc3n3geFSbBtmJvEl4nz) - Odoo Indonesia vITraining
+* [Tutorial Blockchain Bahasa Indonesia](https://www.youtube.com/playlist?list=PLH1gH0TmFBBhvZi4kEqU6kCjyv_y8qBae) - Ipung DEV Academy (YouTube)
 
 
 ### TypeScript