docs: add compatibility doc

Author: marjune163

doc/en-US/compatibility.md

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+# Compiler compatibility
+
+## FreeBSD platform
+- Go 1.9 is the last release supports FreeBSD 9.3
+- Go 1.10 supports FreeBSD 10.3+
+
+## OpenBSD platform
+- Go 1.9 supports OpenBSD 6.0+
+- Go 1.9 no longer supports OpenBSD 5.9
+- Go 1.10 is the last release supports OpenBSD 6.0
+- Go 1.11 requires OpenBSD 6.2+
+
+## OSX Darwin platform
+- Go 1.10 is the last release supports OSX 10.8 Mountain Lion
+- Go 1.10 is the last release supports OSX 10.9 Mavericks
+- Go 1.11 supports OSX 10.10 Yosemite or later
+- Go 1.12 is the last release supports OSX 10.10 Yosemite
+- Go 1.13 supports OSX 10.11 El Capitan or later
+- Go 1.14 is the last release supports OSX 10.11 El Capitan
+- Go 1.15 supports OSX 10.12 Sierra or later
+
+## Windows platform
+- Go 1.10 is the last release supports Windows XP
+- Go 1.10 is the last release supports Windows Vista
+- Go 1.11 supports Windows 7+
+
+# Standard library compatibility
+## SSL/TLS protocol
+- Go 1.13 is the last release supports SSLv3

doc/zh-CN/compatibility.md

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+# 编译器兼容性
+
+## FreeBSD平台
+- Go 1.9是最后支持FreeBSD 9.3的版本
+- Go 1.10支持FreeBSD 10.3+
+
+## OpenBSD平台
+- Go 1.9支持OpenBSD 6.0+
+- Go 1.9不再支持OpenBSD 5.9
+- Go 1.10是最后支持OpenBSD 6.0的版本
+- Go 1.11支持OpenBSD 6.2+
+
+## OSX Darwin平台
+- Go 1.10是最后支持OSX 10.8 Mountain Lion的版本
+- Go 1.10是最后支持OSX 10.9 Mavericks的版本
+- Go 1.11支持OSX 10.10 Yosemite及后续版本
+- Go 1.12是最后支持OSX 10.10 Yosemite的版本
+- Go 1.13支持OSX 10.11 El Capitan及后续版本
+- Go 1.14是最后支持OSX 10.11 El Capitan的版本
+- Go 1.15支持OSX 10.12 Sierra及后续版本
+
+## Windows平台
+- Go 1.10是最后支持Windows XP的版本
+- Go 1.10是最后支持Windows Vista的版本
+- Go 1.11支持Windows 7+
+
+# 标准库兼容性
+## SSL/TLS protocol
+- Go 1.13是最后支持SSLv3的版本