add abseil recipe

recipes/abseil/all/test_package/test_package.cpp

@@ -0,0 +1,56 @@
+#include <string>
+#include <utility>
+#include <iostream>
+#include <vector>
+
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_split.h"
+#include "absl/container/flat_hash_map.h"
+#include "absl/container/flat_hash_set.h"
+#include "absl/numeric/int128.h"
+#include "absl/time/time.h"
+#include "absl/types/variant.h"
+
+int main()
+{
+    absl::flat_hash_set<std::string> set1;
+    absl::flat_hash_map<int, std::string> map1;
+    absl::flat_hash_set<std::string> set2 = {
+        {"huey"},
+        {"dewey"},
+        {"louie"},
+    };
+    absl::flat_hash_map<int, std::string> map2 = {
+        {1, "huey"},
+        {2, "dewey"},
+        {3, "louie"},
+    };
+    absl::flat_hash_set<std::string> set3(set2);
+    absl::flat_hash_map<int, std::string> map3(map2);
+
+    absl::flat_hash_set<std::string> set4;
+    set4 = set3;
+    absl::flat_hash_map<int, std::string> map4;
+    map4 = map3;
+
+    absl::flat_hash_set<std::string> set5(std::move(set4));
+    absl::flat_hash_map<int, std::string> map5(std::move(map4));
+    absl::flat_hash_set<std::string> set6;
+    set6 = std::move(set5);
+    absl::flat_hash_map<int, std::string> map6;
+    map6 = std::move(map5);
+
+    const absl::uint128 big = absl::Uint128Max();
+    std::cout << absl::StrCat("Arg ", "foo", "\n");
+    std::vector<std::string> v = absl::StrSplit("a,b,,c", ',');
+
+    absl::Time t1 = absl::Now();
+    absl::Time t2 = absl::Time();
+    absl::Time t3 = absl::UnixEpoch();
+
+    absl::variant<int> v1 = absl::variant<int>();
+    absl::bad_variant_access e1;
+
+    std::string const year = absl::FormatTime("%Y", absl::Now(), absl::UTCTimeZone());
+    std::cout << "year " << year << std::endl;
+}