Add build script

.gitignore

@@ -1 +1,2 @@
-/build-*
+build-*
+build/

iconconvert/build.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+if [[ $PWD != *"esp-gui-lib/iconconvert"* ]] || [[ $0 != *"build.sh"* ]]; then
+    echo "This script must be run from the iconconvert directory"
+    exit 1
+fi
+
+
+# check if qmake is installed
+if ! command -v qmake; then
+    echo "Qmake is not installed"
+    exit 1
+fi
+
+# check if make is installed
+if ! command -v make; then
+    echo "Make is not installed"
+    exit 1
+fi
+
+mkdir -p build
+cd build || exit 1
+qmake ..
+make
+cd ..