rewrite for eet 2.0 api version v4

.env.example

@@ -0,0 +1,17 @@
+# Copy this file to a location outside version control and fill in test values.
+# Never commit the copy or a PKCS#12 file.
+
+EETCPP_PLAYGROUND=./build/playground/EetCppPlayground
+EET_ENDPOINT=https://replace-with-official-eet-test-endpoint
+EET_PKCS12_PATH=/secure/path/eet-test-certificate.p12
+EET_PKCS12_PASSWORD=replace-with-secret
+EET_EIC=CZ123456789
+EET_UNIT_ID=1
+EET_REGISTER_ID=PLAYGROUND
+EET_RECEIPT_NUMBER=PLAYGROUND-001
+EET_AMOUNT=100.00
+EET_TIMEOUT_MS=30000
+
+CA_API_URL=https://ca.test.caeet.gov.cz/api
+CA_SIGNING_PKCS12_PATH=/secure/path/eet-old-certificate.p12
+CA_SIGNING_PASSWORD=replace-with-secret