Add syntax highlighting to readme

README.md

@@ -4,11 +4,15 @@ Initialisation
 Before you can use libbase58 for base58check, you must provide a SHA256
 function. The required function signature is:
 
- bool my_sha256(void *digest, const void *data, size_t datasz)
+```c
+bool my_sha256(void *digest, const void *data, size_t datasz)
+```
 
 Simply assign your function to b58_sha256_impl:
 
- b58_sha256_impl = my_sha256;
+```c
+b58_sha256_impl = my_sha256;
+```
 
 This is only required if base58check is used. Raw base58 does not need SHA256.
 
@@ -19,7 +23,9 @@ Decoding Base58
 Simply allocate a buffer to store the binary data in, and set a variable with
 the buffer size, and call the b58tobin function:
 
- bool b58tobin(void *bin, size_t *binsz, const char *b58, size_t b58sz)
+```c
+bool b58tobin(void *bin, size_t *binsz, const char *b58, size_t b58sz)
+```
 
 The "canonical" base58 byte length will be assigned to binsz on success, which
 may be larger than the actual buffer if the input has many leading zeros.
@@ -34,7 +40,9 @@ Validating Base58Check
 After calling b58tobin, you can validate base58check data using the b58check
 function:
 
- int b58check(const void *bin, size_t binsz, const char *b58, size_t b58sz)
+```c
+int b58check(const void *bin, size_t binsz, const char *b58, size_t b58sz)
+```
 
 Call it with the same buffers used for b58tobin. If the return value is
 negative, an error occurred. Otherwise, the return value is the base58check
@@ -47,7 +55,9 @@ Encoding Base58
 Allocate a string to store the base58 content, create a size_t variable with the
 size of that allocation, and call:
 
- bool b58enc(char *b58, size_t *b58sz, const void *data, size_t binsz)
+```c
+bool b58enc(char *b58, size_t *b58sz, const void *data, size_t binsz)
+```
 
 Note that you must pass a pointer to the string size variable, not the size
 itself. When b58enc returns, the variable will be modified to contain the actual
@@ -62,5 +72,7 @@ Encoding Base58Check
 Targeting base58check is done similarly to raw base58 encoding, but you must
 also provide a version byte:
 
- bool b58check_enc(char *b58c, size_t *b58c_sz, uint8_t ver,
- const void *data, size_t datasz)
+```c
+bool b58check_enc(char *b58c, size_t *b58c_sz, uint8_t ver,
+ const void *data, size_t datasz)
+```