Add Android network security configuration

src/System.Net.TestData/readme.md

@@ -2,6 +2,9 @@
 
 This package contains test certificates for `System.Net` library.
 
-The TestData directory is considered obsolete. The certificates are encrypted with RC2 and triple des encryption. The pfx password is `testcertificate`.
+The `TestData` directory is considered obsolete. The certificates are encrypted with RC2 and triple des encryption. The pfx password is `testcertificate`.
+
+The `TestDataCertificates` directory contains the same pfx certificates as in `TestData` however they are all encrypted by triple des encryption. The pfx password is `PLACEHOLDER`.
+
+The `res` directory is necessary for running tests on Android. It contains the `network_security_config.xml` file and public keys in the PEM format exported from the pfx certificates in the `TestDataCertificates` directory (see [Network security configuration on Android](https://developer.android.com/training/articles/security-config)).
 
-The TestDataCertificates directory contains the same pfx certificates as in TestData however they are all encrypted by triple des encryption. The pfx password is `PLACEHOLDER`.

src/System.Net.TestData/res/raw/ndx_test_root_ca.pem

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDEzCCAfugAwIBAgIQMmqZISHkNa9CRIejcKfJ0zANBgkqhkiG9w0BAQsFADAb
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+7Sp7I7L/ckSl2KVdDH8BZqCp2GO1Ct0=
+-----END CERTIFICATE-----

src/System.Net.TestData/res/raw/testselfsignedservereku_contoso_com.pem

@@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
+MIIFLDCCAxSgAwIBAgIQfmtqh0j0E4xKOEtQct2gDDANBgkqhkiG9w0BAQsFADAu
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+-----END CERTIFICATE-----

src/System.Net.TestData/res/xml/network_security_config.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<network-security-config>
+    <base-config>
+        <trust-anchors>
+            <certificates src="@raw/ndx_test_root_ca"/>
+            <certificates src="@raw/testselfsignedservereku_contoso_com"/>
+            <certificates src="system"/>
+        </trust-anchors>
+    </base-config>
+</network-security-config>