install.sh: check requirements

install.sh

@@ -27,6 +27,17 @@ function msg_err() {
     esac
 }
 
+
+# Check Requirements
+# -------------------
+programs=("wget" "curl" "git" "less")
+for program in "${programs[@]}"; do
+    if ! command -v "$program" &>/dev/null; then
+        msg_err "$program no está instalado." \
+                "$program is not installed" && exit 1
+    fi
+done
+
 # Check URL's
 # -----------
 function _which() {