[feat] docs: add misc/completion/duniter_completion.bash script

Script to add bash completion to duniter cli command

See #1403 (closed)

release/arch/linux/build-lin.sh

@@ -83,6 +83,15 @@ build_extra_desktop() {
 	cp -r "${ROOT}/release/extra/desktop/"* "${1}" || exit 1
 }
 
+# Bash completion specific building phase.
+# -
+# Parameters:
+# 1. Building directory.
+build_extra_completion() {
+  mkdir -p "${1}/completion" || exit 1
+	cp -r "${ROOT}/release/extra/completion/"* "${1}/completion" || exit 1
+}
+
 # Server specific building phase.
 # -
 # Parameters: