Binary project specifications for Carthage

Host the specs so that Carthage projects can depend on this library.
Note that we still have to respect Carthage versioning policy.

Author: ilammy

carthage/README.md

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+Carthage binary frameworks
+==========================
+
+Here you can find JSON files with [binary project specifications][1] for Carthage.
+Update these files with new versions when doing the release.
+
+[1]: https://github.com/Carthage/Carthage/blob/master/Documentation/Artifacts.md#binary-project-specification
+
+Note that Carthage **requires** semver-compatible versions.
+That is, the version must have three components.
+OpenSSL uses a peculiar versioning scheme which has four components
+where patch version is indicated by a letter.
+OpenSSL versions are translated to Carthage versions by renumbering like this:
+
+| OpenSSL version | Carthage version |
+| --------------- | ---------------- |
+| 1.0.2           | 1.0.200          |
+| 1.0.2a          | 1.0.201          |
+| 1.0.2u          | 1.0.221          |
+| 1.1.1           | 1.1.100          |
+| 1.1.1a          | 1.1.101          |
+| 1.1.1g          | 1.1.107          |

carthage/openssl-iOS.json

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+{
+    "1.0.221": "https://github.com/cossacklabs/openssl-apple/releases/download/v1.0.2u/openssl-iOS.zip"
+}

carthage/openssl-macOS.json

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+{
+    "1.0.221": "https://github.com/cossacklabs/openssl-apple/releases/download/v1.0.2u/openssl-macOS.zip"
+}