Update README.md

gamestonk_terminal/resource_collection/README.md

@@ -4,6 +4,14 @@ This menu aims to store a collection of useful resources that can't be scraped,
 
 * [hfletters](#hfletters)
   * hedge fund letters or reports
+* [arxiv](#arxiv)
+  * open-access archive for academic articles
+* [finra](#finra)
+  * self-regulatory organization
+* [edgar](#edgar)
+  * online public database from SEC
+* [fred](#fred)
+  * economic research data
 * [learn](#learn)
   * trading analysis, tips and resources
 
@@ -18,6 +26,42 @@ usage: hfletters
 <img width="1227" alt="Captura de ecrã 2021-05-01, às 21 14 08" src="https://user-images.githubusercontent.com/25267873/116794053-3edd4d00-aac2-11eb-8abf-5a3a32ae3484.png">
 
 
+## arxiv <a name="arxiv"></a>
+
+```text
+usage: arxiv
+```
+
+<img width="1279" alt="arxiv" src="https://user-images.githubusercontent.com/25267873/117510134-6f6e2c80-af83-11eb-9458-a7a160bb57f0.png">
+
+
+## finra <a name="finra"></a>
+
+```text
+usage: finra
+```
+
+<img width="1278" alt="finra" src="https://user-images.githubusercontent.com/25267873/117510141-7137f000-af83-11eb-8b07-65176791bf72.png">
+
+
+## edgar <a name="edgar"></a>
+
+```text
+usage: edgar
+```
+
+<img width="1278" alt="edgar" src="https://user-images.githubusercontent.com/25267873/117510138-709f5980-af83-11eb-8968-919e4235d480.png">
+
+
+## fred <a name="fred"></a>
+
+```text
+usage: fred
+```
+
+<img width="1279" alt="fred" src="https://user-images.githubusercontent.com/25267873/117510128-6c733c00-af83-11eb-9dfe-8a86412aeefb.png">
+
+
 ## learn <a name="learn"></a>
 
 ```text