Dev changes merged into ProfilePicLayer branch

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+Certain actions with the API require User authentication. In DevHive, all authentication is done with [JSON Web Tokens](https://en.wikipedia.org/wiki/JSON_Web_Token). 
+
+The JWTs must be sent as a [Bearer Token](https://www.oauth.com/oauth2-servers/differences-between-oauth-1-2/bearer-tokens/).
+
+## Structure of tokens
+
+The main contents of a User's token are the `UserName`, `ID` and `Roles`.
+
+Sample token:
+```
+eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJJRCI6IjI3ZTIwM2JkLTUzMTItNDgzMS05MzM0LWNkM2MyMGU1ZDY3MiIsIlVzZXJuYW1lIjoidGVzdCIsInJvbGUiOiJVc2VyIiwibmJmIjoxNjEyMzYxOTc1LCJleHAiOjE2MTI5MDgwMDAsImlhdCI6MTYxMjM2MTk3NX0.ZxhDSUsDf9cGig03QpzNgj3dkqbcfAoFXVIfixYGurzhd0l1_IO79UpE_Sb6ZU9hz3IT1XPrlrQ_Kd46L7xcQg
+```
+[Decoded](https://jwt.io/):
+
+- Header
+```json
+{
+  "alg": "HS512",
+  "typ": "JWT"
+}
+```
+
+- Data
+```json
+{
+  "ID": "27e203bd-5312-4831-9334-cd3c20e5d672",
+  "Username": "test",
+  "role": "User",
+  "nbf": 1612361975,
+  "exp": 1612908000,
+  "iat": 1612361975
+}
+```
+
+- Signature
+```
+HMACSHA512(
+  base64UrlEncode(header) + "." +
+  base64UrlEncode(payload)
+)
+```
+
+## Token validation
+
+All token validations are done in the User Service. Depending on the situation, we can differentiate a couple types of authentication:
+
+|||
+|---|---|
+|1|Has the role "User" or "Admin"|
+|2|Has the role "User" and is the owner/author of the object or has the role "Admin"|
+|3|Has the role "Admin"|
+|||
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