Feature: array sum circuit

.gitignore

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 .elixir_ls
 .vscode
+.DS_Store

circuits/array_add/.gitignore

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+build

circuits/array_add/README.md

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+# array_sum.aleo
+
+## Build Guide
+
+To compile this Aleo program, run:
+```bash
+aleo build
+```

circuits/array_add/auxiliary_code_generator.py

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+# Here the output is:
+# input r0 as field;
+# input r1 as field;
+# ...
+# input r253 as field;
+for i in range(254):
+    print("\tinput r{} as field.public;".format(i))
+
+# Here the output is:
+# add r0 r1 into r254;
+# add r254 r2 into r255;
+# ...
+# add r0.a253 r252 into r253;
+print("\n\tadd r0 r1 into r254;")
+for i in range(254, 507):
+    print("\tadd r{} r{} into r{};".format(i, i-253, i+1))
+print("\n\toutput r507 as field.public;")
+
+# The command for running a simple test:
+print("aleo run hash_array_add ", end='')
+for i in range(254):
+    print("{}field ".format(i), end='')