add 2 references for Chapter 1-5

references.bib

@@ -1,3 +1,22 @@
+@techreport{baobiao2020,
+ author = {工信部},
+ title = {2019年全国软件和信息技术服务业主要指标快报表},
+ institution = {工信部},
+ year = {2020},
+ month = {2},
+ address = {http://www.miit.gov.cn/n1146312/n1146904/n1648374/c7663942/content.html}
+}
+
+@techreport{ITIndustryOutlook2020,
+ author = {美国计算机行业协会（CompTIA）},
+ title = { IT Industry Outlook 2020},
+ institution = {美国计算机行业协会（CompTIA）},
+ year = {2020},
+ month = {1},
+ address = {https://www.comptia.org/content/research/it-industry-trends-analysis}
+}
+
+
 @inproceedings{10.1145/2830903.2830906,
 author = {Liskov, Barbara},
 title = {Perspectives on System Languages and Abstraction},