Add python bindings + package (#10)

* wip : python package

* wip : minor fixes

* wip : upload package to main pypi

* wip : initial text encoding

* wip : extending C api

* wip : use map of global instances

* wip : added decode functionality

* update main README

bindings/python/cggwave.pxd

@@ -0,0 +1,42 @@
+cdef extern from "ggwave.h" nogil:
+
+    ctypedef enum ggwave_SampleFormat:
+        GGWAVE_SAMPLE_FORMAT_I16,
+        GGWAVE_SAMPLE_FORMAT_F32
+
+    ctypedef enum ggwave_TxProtocol:
+        GGWAVE_TX_PROTOCOL_AUDIBLE_NORMAL,
+        GGWAVE_TX_PROTOCOL_AUDIBLE_FAST,
+        GGWAVE_TX_PROTOCOL_AUDIBLE_FASTEST,
+        GGWAVE_TX_PROTOCOL_ULTRASOUND_NORMAL,
+        GGWAVE_TX_PROTOCOL_ULTRASOUND_FAST,
+        GGWAVE_TX_PROTOCOL_ULTRASOUND_FASTEST
+
+    ctypedef struct ggwave_Parameters:
+        int sampleRateIn
+        int sampleRateOut
+        int samplesPerFrame
+        ggwave_SampleFormat formatIn
+        ggwave_SampleFormat formatOut
+
+    ctypedef int ggwave_Instance
+
+    ggwave_Parameters ggwave_defaultParameters();
+
+    ggwave_Instance ggwave_init(const ggwave_Parameters parameters);
+
+    void ggwave_free(ggwave_Instance instance);
+
+    int ggwave_encode(
+            ggwave_Instance instance,
+            const char * dataBuffer,
+            int dataSize,
+            ggwave_TxProtocol txProtocol,
+            int volume,
+            char * outputBuffer);
+
+    int ggwave_decode(
+            ggwave_Instance instance,
+            const char * dataBuffer,
+            int dataSize,
+            char * outputBuffer);