Update to v1.4 (#251)

* Finish PPP entirely and Finish Appendix E for DG

* Update to v1.4

build.gradle

@@ -38,7 +38,7 @@ javafx {
 
 shadowJar {
     archiveBaseName = "Ducats"
-    archiveVersion = "1.3.1"
+    archiveVersion = "1.4"
     archiveClassifier = null
     archiveAppendix = null
 }

docs/DeveloperGuide.adoc

@@ -118,7 +118,7 @@ This section describes in detail the implementation of the various features, as
 
 === Command Parsing and Execution
 
-Since Ducats is a CLI app, it works by reading user input and carrying out the command the user wants it to execute. In line with this objective, the different components of Ducats have been designed to interact in the sequence as depicted by Figure X.
+Since Ducats is a CLI app, it works by reading user input and carrying out the command the user wants it to execute. In line with this objective, the different components of Ducats have been designed to interact in the sequence as depicted by Figure 2.
 
 .Command Parsing and Execution Sequence Diagram
 image::Command_Sequence_Diagram.png[]
@@ -576,7 +576,7 @@ In order to ensure that the songs the user has created, deleted or modified can
 .Reading files (for each file)
 image::storage_read.png[]
 
-Before reading from the files, an assertion is made for the file list of the data folder (obtained through the `File.listFiles()` method) to not be null. The reading process as described in Figure X is then repeated for each file in the file list.
+Before reading from the files, an assertion is made for the file list of the data folder (obtained through the `File.listFiles()` method) to not be null. The reading process as described in Figure 3 is then repeated for each file in the file list.
 
 .Writing to files (for each song)
 image::storage_write.png[]
@@ -875,9 +875,69 @@ Since music contains a lot of repeating parts, we have implemented a grouping fe
 
 `group START_NUM END_NUM GROUP_NAME`
 
-//todo
+Hence, *after you add a few more bars* to twinkle, you can group the first two bars together and name it "verse" using the following command:
 
+    group 1 2 verse
 
+Now that you have a group defined inside a song, there are different operations you can do with it. One of them would be to insert the group into the song at a specific bar. This is done using the `copy` command. To add the group to the 4th index of the song, key in this command:
+
+    copy verse 4
+
+Do note that this will only work if you have more than 4 bars. Running `ascii song twinkle` will show that the group has been added to the specified location. The command `list_group` will display the list of groups in the opened song, and the format is as follows:
+
+    list_group
+
+=== Viewing the song
+
+Previously, we have seen how you can view the whole song with `ascii song`, with the following format:
+
+`ascii song s/SONG_NAME`
+
+Other than songs, individual groups can also be viewed with `ascii group`, and the format is as follows:
+
+`ascii group s/GROUP_NAME`
+
+Hence, when twinkle is opened, to view the group "verse", you can key in the command
+
+    ascii group verse
+
+Individual bars can be viewed with `ascii bar`, and the format is as follows:
+
+`ascii bar n/BAR_INDEX`
+
+=== Undo, redo and delete
+
+Execute the following commands
+
+    new deleteme c 4/4 120
+
+Ducats has an undo/redo functionality that makes it easy to reverse your mistakes. By keying in the command
+
+    undo
+
+, the creation of the new song will be reversed. This action will be reversed upon the command
+
+    redo
+
+The `delete` command can be used to delete the whole song.
+
+    delete deleteme
+
+will delete the song named "deleteme" from the list of songs.
+
+=== Starting a metronome
+
+A metronome can be started with the following command:
+
+    metronome 10 120 4/4
+
+The format for the `metronome` command is as follows:
+
+`metronome n/DURATION_IN_BARS n/TEMPO s/TIME_SIGNATURE`
+
+=== Continued testing
+
+This appendix should have provided a better understanding of how Ducats works. Do note that, in many cases, the features are not described in maximum detail. Additionally, this list of features is far from exhaustive. Please refer to the link:https://github.com/AY1920S1-CS2113T-F09-4/main/blob/master/docs/UserGuide.adoc[User Guide] for a more detailed description of all the features, and their corresponding formatting.