Add spongy castle sources to libraries folder

libraries/spongycastle/.gitattributes

@@ -0,0 +1,14 @@
+# Set default behaviour, in case users don't have core.autocrlf set.
+*          text=auto
+
+# Explicitly declare text files we want to always be normalized and converted 
+# to native line endings on checkout.
+*.gradle   text diff=groovy
+*.html     text diff=html
+*.java     text diff=java
+*.pem      text
+
+# Denote all files that are truly binary and should not be modified.
+*.png binary
+*.jpg binary
+*.data binary