support bazel complie this project and format code.

basic_content/abstract/BUILD

@@ -0,0 +1,43 @@
+# you can run some main program, just replace binary name
+# such as: `bazel run basic_content/abstract:interesting_facts1`
+#          `bazel run basic_content/abstract:interesting_facts2`
+# etc...
+load("@rules_cc//cc:defs.bzl", "cc_binary")
+
+# Don't panic if you get compilation errors, this is what this code demonstrates, as expected.
+cc_binary(
+    name = "interesting_facts1",
+    srcs = ["interesting_facts1.cpp"],
+)
+
+cc_binary(
+    name = "interesting_facts2",
+    srcs = ["interesting_facts2.cpp"],
+)
+
+# Don't panic if you get compilation errors, this is what this code demonstrates, as expected.
+cc_binary(
+    name = "interesting_facts3",
+    srcs = ["interesting_facts3.cpp"],
+)
+
+cc_binary(
+    name = "interesting_facts4",
+    srcs = ["interesting_facts4.cpp"],
+)
+
+cc_binary(
+    name = "interesting_facts5",
+    srcs = ["interesting_facts5.cpp"],
+)
+
+# Don't panic if you get compilation errors, this is what this code demonstrates, as expected.
+cc_binary(
+    name = "pure_virtual",
+    srcs = ["pure_virtual.cpp"],
+)
+
+cc_binary(
+    name = "derived_full",
+    srcs = ["derived_full.cpp"],
+)