Medusa System Added

Read about the medusa system [here](https://nadekobot.readthedocs.io/en/latest/medusa/creating-a-medusa/)

src/NadekoBot/data/strings/commands/commands.en-US.yml

@@ -2151,3 +2151,34 @@ deleteemptyservers:
   desc: "Deletes all servers in which the bot is the only member."
   args:
     - ""
+medusaload:
+  desc: |- 
+    Loads a medusa with the specified name from the data/medusae/ folder.
+    Provide no name to see the list of loadable medusae.
+    Read about the medusa system [here](https://nadekobot.readthedocs.io/en/latest/medusa/creating-a-medusa/)
+  args:
+    - "mycoolmedusa"
+    - ""
+medusaunload:
+  desc: |-
+    Unloads the previously loaded medusa.
+    Provide no name to see the list of unloadable medusae. 
+    Read about the medusa system [here](https://nadekobot.readthedocs.io/en/latest/medusa/creating-a-medusa/)
+  args:
+    - "mycoolmedusa"
+    - ""
+medusainfo:
+  desc: |-
+    Shows information about the specified medusa such as the author, name, description, list of sneks, number of commands etc.
+    Provide no name to see the basic information about all loaded medusae. 
+    Read about the medusa system [here](https://nadekobot.readthedocs.io/en/latest/medusa/creating-a-medusa/)
+  args:
+    - "mycoolmedusa"
+    - ""
+medusalist: 
+  desc: |-
+    Lists all loaded and unloaded medusae.
+    Read about the medusa system [here](https://nadekobot.readthedocs.io/en/latest/medusa/creating-a-medusa/)
+  args:
+    - ""
+