add missing prototxt

models/dense_cap/solver_joint_inference.prototxt

@@ -0,0 +1,17 @@
+train_net: "models/dense_cap/train_cap_joint_inference.prototxt"
+base_lr: 0.001
+lr_policy: "step"
+gamma: 0.5
+stepsize: 100000
+display: 20
+average_loss: 100
+momentum: 0.98
+weight_decay: 0.000
+train_state: {stage: 'freeze-convnet'}
+# We disable standard caffe solver snapshotting and implement our own snapshot
+# function
+snapshot: 0
+# We still use the snapshot prefix, though
+snapshot_prefix: "dense_cap_joint_inference"
+clip_gradients: 40
+#debug_info: true