added composer files and installed vendor packages. Also modified xsls to display base project

vendor/tecnickcom/tc-lib-pdf/test/fixtures/css/parser/complex_values.css

@@ -0,0 +1,12 @@
+a[href^="mailto:"]::after {
+  content: "mailto:user@example.com;subject=test";
+}
+
+div[data-url*="example.com?a=1&b=2"] {
+  background-image: url("https://example.com/a;b.png?x=1&y=2");
+  font-family: "Open Sans", "Noto Sans", sans-serif;
+}
+
+p.note {
+  background: linear-gradient(90deg, rgba(0,0,0,.1), rgba(255,255,255,.8));
+}

vendor/tecnickcom/tc-lib-pdf/test/fixtures/css/parser/escaped_selectors.css

@@ -0,0 +1,3 @@
+.icon\:warning[data-kind="print-a"]:first-child { color: red; }
+#hero\#title > a.link\+cta[href*="campaign=42"] { margin: 0; }
+nav ul li:nth-child(2) > a[title="A > B"] { text-decoration: underline; }