Added $displayName (#327)

* Create displayName.md

* Create displayNameComplex.md

* Update displayName.md

* Update SUMMARY.md

src/SUMMARY.md

@@ -154,6 +154,8 @@
     - [$disableInnerSpaceRemoval](./bdscript/disableInnerSpaceRemoval.md)
     - [$disableSpecialEscaping](./bdscript/disableSpecialEscaping.md)
     - [$discriminator](./bdscript/discriminator.md)
+    - [$displayName](./bdscript/displayName.md)
+    - [$displayName[]](./bdscript/displayNameComplex.md)
     - [$divide](./bdscript/divide.md)
     - [$dm](./bdscript/dm.md)
     - [$dmChannelID](./bdscript/dmChannelID.md)

src/bdscript/displayName.md

@@ -0,0 +1,14 @@
+# $displayName
+Returns the author's display name.
+
+## Syntax
+```
+$displayName
+```
+
+## Example
+```
+$nomention
+Your display name is `$displayName`
+```
+![example](https://user-images.githubusercontent.com/111157596/249784142-f89e590e-cdf2-4226-bdf5-082b52533329.png)

src/bdscript/displayNameComplex.md

@@ -0,0 +1,17 @@
+# $displayName[]
+Returns the display name of the given user.
+
+## Syntax
+```
+$displayName[User ID]
+```
+
+### Parameters
+- `User ID` `(Type: Snowflake || Flag: Required)`: The user to get the display name for.
+
+## Example
+```
+$nomention
+**$username[$message[1]]**'s display name is `$displayName[$message[1]]`
+```
+![example](https://user-images.githubusercontent.com/111157596/249786688-61ed7be7-2c9d-48f0-8a7a-280e498a09e7.png)