add philipp as author to certs

ETH_CERTS.md

@@ -0,0 +1,26 @@
+# Certificates
+
+This document serves as proof that the following authors have access to this repository, publishing rights and are in possession of the stated Ethereum addresses and their corresponding public & private key pairs:
+
+```
+[
+  { 
+    protected: 'eyJhbGciOiJFUzI1NksiLCJiNjQiOmZhbHNlLCJjcml0IjpbImI2NCJdfQ',
+    payload: { 
+      'key:alg': 'eth',
+      'key:address': '0x8c2df4ac4cfa414e298ad5ee9d634e7f1a02dd1b',
+      name: 'Philipp Langhans',
+      email: 'philipp@ethereum.org',
+      iss: '0x8c2df4ac4cfa414e298ad5ee9d634e7f1a02dd1b',
+      sub: '0x8c2df4ac4cfa414e298ad5ee9d634e7f1a02dd1b',
+      iat: 1550680972,
+      exp: 1551890572,
+      nbf: 1550680972,
+      jti: 'c6d619fd48b3be5fe05a05da4dd0c869' 
+    },
+    signature: 'YFEBArEnXEi_TSa0jtGeyhtcbElZuHTr04jV5n-vIFtxH4ojqufjDk_O9TBZdjnqzrc_hQBXIDkmP89d2zPzsw' 
+  }
+]
+```
+
+The provided software will only load and execute code packages that were signed by `one or multiple` authors using [Ethereum Signed Packages](https://github.com/PhilippLgh/ethereum-signed-packages).